
<PAGE>

                                                                     Exhibit 4.2

                                  $100,000,000

                               ANTEON CORPORATION

                     12% SENIOR SUBORDINATED NOTES DUE 2009

                          REGISTRATION RIGHTS AGREEMENT

                                                                     May 6, 1999

Credit Suisse First Boston Corporation
Deutsche Bank Securities Inc.
Legg Mason Wood Walker, Incorporated
      c/o Credit Suisse First Boston Corporation
      Eleven Madison Avenue
      New York, New York 10010-3629

Dear Sirs:

      Anteon Corporation, a Virginia corporation (the "ISSUER"), proposes to
issue and sell to Credit Suisse First Boston Corporation, Deutsche Bank
Securities Inc. and Legg Mason Wood Walker, Incorporated (collectively, the
"INITIAL PURCHASERS"), upon the terms set forth in a purchase agreement of even
date herewith (the "PURCHASE AGREEMENT"), $100,000,000 aggregate principal
amount of its 12% Senior Subordinated Notes Due 2009 (the "INITIAL SECURITIES")
to be unconditionally guaranteed on a senior subordinated basis by each of the
Issuer's domestic wholly-owned subsidiaries (the "GUARANTORS" and, together with
the Issuer, the "COMPANY"). The Initial Securities will be issued pursuant to an
Indenture, dated as of May 11, 1999 (the "INDENTURE"), among the Issuer, the
Guarantors and IBJ Whitehall Bank & Trust Company, as trustee (the "TRUSTEE").
As an inducement to the Initial Purchasers to enter into the Purchase Agreement,
the Company agrees with the Initial Purchasers, for the benefit of the holders
of the Initial Securities (including, without limitation, the Initial
Purchasers), the Exchange Securities (as defined below) and the Private Exchange
Securities (as defined below) (collectively, the "HOLDERS"), as follows:

      1. REGISTERED EXCHANGE OFFER. The Company shall, at its own cost, prepare
and, not later than 90 days after (or if the 90th day is not a business day, the
first business day thereafter) the date of original issue of the Initial
Securities (the "ISSUE DATE"), file with the Securities and Exchange Commission
(the "COMMISSION") a registration statement (the "EXCHANGE OFFER REGISTRATION
STATEMENT") on an appropriate form under the Securities Act of 1933, (the
"SECURITIES ACT"), with respect to a proposed offer (the "REGISTERED EXCHANGE
OFFER") to the Holders of Transfer Restricted Securities (as defined in Section
6 hereof), who are not prohibited by any law or policy of the Commission from
participating in the Registered Exchange Offer, to issue and deliver to such
Holders, in exchange for the Initial Securities, a like aggregate principal
amount of debt securities (the "EXCHANGE SECURITIES") of the Company issued
under the Indenture and identical in all material respects to the Initial
Securities (except for the transfer restrictions relating to the Initial
Securities and the provisions relating to the matters described in Section 6
hereof) that would be registered under the Securities Act. The Company shall use
its best efforts to cause such Exchange Offer Registration Statement to become
effective under the Securities Act within 150 days (or if the 150th day is not a
business day, the first business day thereafter) after the Issue Date of the
Initial Securities and shall keep the Exchange Offer Registration Statement
effective for not less than 30 days (or longer, if required by applicable law)
after the date notice of the Registered Exchange Offer is mailed to the Holders
(such period being called the "EXCHANGE OFFER REGISTRATION PERIOD").

      If the Company effects the Registered Exchange Offer, the Company will be
entitled to close the Registered Exchange Offer 30 days after the commencement
thereof provided that the Company has accepted all the Initial Securities
theretofore validly tendered in accordance with the terms of the Registered
Exchange Offer.

      Following the declaration of the effectiveness of the Exchange Offer
Registration Statement, the Company shall promptly commence the Registered
Exchange Offer, it being the objective of such Registered Exchange Offer to
enable each Holder of Transfer Restricted Securities (as defined in Section 6
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hereof) electing to exchange the Initial Securities for Exchange Securities
(assuming that such Holder is not an affiliate of the Company within the meaning
of the Securities Act, acquires the Exchange Securities in the ordinary course
of such Holder's business and has no arrangements with any person to participate
in the distribution of the Exchange Securities and is not prohibited by any law
or policy of the Commission from participating in the Registered Exchange Offer)
to trade such Exchange Securities from and after their receipt without any
limitations or restrictions under the Securities Act and without material
restrictions under the securities laws of the several states of the United
States.

      The Company acknowledges that, pursuant to current interpretations by the
Commission's staff of Section 5 of the Securities Act, in the absence of an
applicable exemption therefrom, (i) each Holder which is a broker-dealer
electing to exchange Initial Securities, acquired for its own account as a
result of market making activities or other trading activities, for Exchange
Securities (an "EXCHANGING DEALER"), is required to deliver a prospectus
containing the information set forth in (a) Annex A hereto on the cover, (b)
Annex B hereto in the "Exchange Offer Procedures" section and the "Purpose of
the Exchange Offer" section, and (c) Annex C hereto in the "Plan of
Distribution" section of such prospectus in connection with a sale of any such
Exchange Securities received by such Exchanging Dealer pursuant to the
Registered Exchange Offer and (ii) an Initial Purchaser that elects to sell
Securities (as defined below) acquired in exchange for Initial Securities
constituting any portion of an unsold allotment, is required to deliver a
prospectus containing the information required by Items 507 or 508 of Regulation
S-K under the Securities Act, as applicable, in connection with such sale.

      The Company shall use its best efforts to keep the Exchange Offer
Registration Statement effective and to amend and supplement the prospectus
contained therein, in order to permit such prospectus to be lawfully delivered
by all persons subject to the prospectus delivery requirements of the Securities
Act for such period of time as such persons must comply with such requirements
in order to resell the Exchange Securities; PROVIDED, HOWEVER, that (i) in the
case where such prospectus and any amendment or supplement thereto must be
delivered by an Exchanging Dealer or an Initial Purchaser, such period shall be
the lesser of 180 days and the date on which all Exchanging Dealers and the
Initial Purchasers have sold all Exchange Securities held by them (unless such
period is extended pursuant to Section 3(j) below) and (ii) the Company shall
make such prospectus and any amendment or supplement thereto available to any
broker-dealer for use in connection with any resale of any Exchange Securities
for a period of not less than 180 days after the consummation of the Registered
Exchange Offer.

      If, upon consummation of the Registered Exchange Offer, an Initial
Purchaser holds Initial Securities acquired by it as part of its initial
distribution, the Company, simultaneously with the delivery of the Exchange
Securities pursuant to the Registered Exchange Offer, shall issue and deliver to
such Initial Purchaser upon the written request of such Initial Purchaser, in
exchange (the "PRIVATE EXCHANGE") for the Initial Securities held by such
Initial Purchaser, a like principal amount of debt securities of the Company
issued under the Indenture and identical in all material respects (including the
existence of restrictions on transfer under the Securities Act and the
securities laws of the several states of the United States, but excluding
provisions relating to the matters described in Section 6 hereof) to the Initial
Securities (the "PRIVATE EXCHANGE SECURITIES"). The Initial Securities, the
Exchange Securities and the Private Exchange Securities are herein collectively
called the "SECURITIES".

      In connection with the Registered Exchange Offer, the Company shall:

            (a) mail to each Holder a copy of the prospectus forming part of the
      Exchange Offer Registration Statement, together with an appropriate letter
      of transmittal and related documents;

            (b) keep the Registered Exchange Offer open for not less than 30
      days (or longer, if required by applicable law) after the date notice
      thereof is mailed to the Holders;

            (c) utilize the services of a depositary for the Registered Exchange
      Offer with an address in the Borough of Manhattan, the City of New York,
      which may be the Trustee or an affiliate of the Trustee;

            (d) permit Holders to withdraw tendered Securities at any time prior
      to the close of business, New York time, on the last business day on which
      the Registered Exchange Offer shall remain open; and

            (e) otherwise comply in all material respects with all applicable
      laws.


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      As soon as practicable after the close of the Registered Exchange Offer or
the Private Exchange, as the case may be, the Company shall:

            (x) accept for exchange all the Securities validly tendered and not
      withdrawn pursuant to the Registered Exchange Offer and the Private
      Exchange;

            (y) deliver to the Trustee for cancellation all the Initial
      Securities so accepted for exchange; and

            (z) cause the Trustee to authenticate and deliver promptly to each
      Holder of the Initial Securities, Exchange Securities or Private Exchange
      Securities, as the case may be, equal in principal amount to the Initial
      Securities of such Holder so accepted for exchange.

      The Indenture will provide that the Exchange Securities will not be
subject to the transfer restrictions set forth in the Indenture and that all the
Securities will vote and consent together on all matters as one class and that
none of the Securities will have the right to vote or consent as a class
separate from one another on any matter.

      Interest on each Exchange Security and Private Exchange Security issued
pursuant to the Registered Exchange Offer and in the Private Exchange will
accrue from the last interest payment date on which interest was paid on the
Initial Securities surrendered in exchange therefor or, if no interest has been
paid on the Initial Securities, from the date of original issue of the Initial
Securities. No interest shall accrue on any Initial Security surrendered in the
Exchange Offer from and after the day that interest begins to accrue on the
Exchange Securities issued in exchange therefor.

      Each Holder participating in the Registered Exchange Offer shall be
required to represent to the Company that at the time of the consummation of the
Registered Exchange Offer (i) any Exchange Securities received by such Holder
will be acquired in the ordinary course of business, (ii) such Holder will have
no arrangements or understanding with any person to participate in the
distribution of the Securities or the Exchange Securities within the meaning of
the Securities Act, (iii) such Holder is not an "affiliate," as defined in Rule
405 of the Securities Act, of the Company or if it is an affiliate, such Holder
will comply with the registration and prospectus delivery requirements of the
Securities Act to the extent applicable, (iv) if such Holder is not a
broker-dealer, that it is not engaged in, and does not intend to engage in, the
distribution of the Exchange Securities and (v) if such Holder is a
broker-dealer, that it will receive Exchange Securities for its own account in
exchange for Initial Securities that were acquired as a result of market-making
activities or other trading activities and that it will be required to
acknowledge that it will deliver a prospectus in connection with any resale of
such Exchange Securities.

      Notwithstanding any other provisions hereof, the Company will ensure that
(i) any Exchange Offer Registration Statement and any amendment thereto and any
prospectus forming part thereof and any supplement thereto complies in all
material respects with the Securities Act and the rules and regulations
thereunder, (ii) any Exchange Offer Registration Statement and any amendment
thereto does not, when it becomes effective, contain an untrue statement of a
material fact or omit to state a material fact required to be stated therein or
necessary to make the statements therein not misleading and (iii) any prospectus
forming part of any Exchange Offer Registration Statement, and any supplement to
such prospectus, does not include an untrue statement of a material fact or omit
to state a material fact required to be stated therein or necessary in order to
make the statements therein, in the light of the circumstances under which they
were made, not misleading.

      2. SHELF REGISTRATION. If, (i) because of any change in law or in
applicable interpretations thereof by the staff of the Commission, the Company
is not permitted to effect a Registered Exchange Offer, as contemplated by
Section 1 hereof, (ii) the Registered Exchange Offer is not consummated within
180 days of the Issue Date, (iii) any Initial Purchaser so requests within 10
business days following consummation of the Registered Exchange Offer with
respect to the Initial Securities (or the Private Exchange Securities) not
eligible to be exchanged for Exchange Securities in the Registered Exchange
Offer and held by it following consummation of the Registered Exchange Offer or
(iv) any Holder (other than an Exchanging Dealer) notifies the Company within 10
business days following consummation of the Registered Exchange Offer that such
Holder is not eligible to participate in the Registered Exchange Offer or such
Holder may not resell the Exchange Notes acquired by it in the Registered
Exchange Offer to the public without delivering a prospectus and the prospectus
contained in the Exchange Offer Registration Statement is not appropriate


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or available for such resales by such Holder; or such Holder is a broker-dealer
and holds Notes that are part of an unsold allotment from the original sale of
the Notes, the Company shall take the following actions:

            (a) The Company shall, at its cost, as promptly as practicable (but
      in no event more than 30 days after so required or requested pursuant to
      this Section 2) file with the Commission and thereafter shall use its best
      efforts to cause to be declared effective a registration statement (the
      "SHELF REGISTRATION STATEMENT" and, together with the Exchange Offer
      Registration Statement, a "REGISTRATION STATEMENT") on an appropriate form
      under the Securities Act relating to the offer and sale of the Transfer
      Restricted Securities (as defined in Section 6 hereof) by the Holders
      thereof from time to time in accordance with the methods of distribution
      set forth in the Shelf Registration Statement and Rule 415 under the
      Securities Act (hereinafter, the "SHELF REGISTRATION"); PROVIDED, HOWEVER,
      that no Holder (other than an Initial Purchaser) shall be entitled to have
      the Securities held by it covered by such Shelf Registration Statement
      unless such Holder agrees in writing to be bound by all the provisions of
      this Agreement applicable to such Holder.

            (b) Subject to Section 3 (j), the Company shall use its best efforts
      to keep the Shelf Registration Statement continuously effective in order
      to permit the prospectus included therein to be lawfully delivered by the
      Holders of the relevant Securities, for a period of two years (or for such
      longer period if extended pursuant to Section 3(j) below) from the date of
      its effectiveness or such shorter period that will terminate when all the
      Securities covered by the Shelf Registration Statement (i) have been sold
      pursuant thereto or (ii) are no longer restricted securities (as defined
      in Rule 144 under the Securities Act, or any successor rule thereof) or
      are saleable pursuant to Rule 144k. The Company shall be deemed not to
      have used its best efforts to keep the Shelf Registration Statement
      effective during the requisite period if it voluntarily takes any action
      that would result in Holders of Securities covered thereby not being able
      to offer and sell such Securities during that period, unless such action
      is required by applicable law.

            (c) Notwithstanding any other provisions of this Agreement to the
      contrary, the Company shall cause the Shelf Registration Statement and the
      related prospectus and any amendment or supplement thereto, as of the
      effective date of the Shelf Registration Statement, or such amendment or
      supplement, (i) to comply in all material respects with the applicable
      requirements of the Securities Act and the rules and regulations of the
      Commission and (ii) not to contain any untrue statement of a material fact
      or omit to state a material fact required to be stated therein or
      necessary in order to make the statements therein, in light of the
      circumstances under which they were made, not misleading.

      3. REGISTRATION PROCEDURES. In connection with any Shelf Registration
contemplated by Section 2 hereof and, to the extent applicable, any Registered
Exchange Offer contemplated by Section 1 hereof, the following provisions shall
apply:

            (a) The Company shall (i) furnish to each Initial Purchaser, prior
      to the filing thereof with the Commission, a copy of the Registration
      Statement and each amendment thereof and each supplement, if any, to the
      prospectus included therein and, in the event that an Initial Purchaser
      (with respect to any portion of an unsold allotment from the original
      offering) is participating in the Registered Exchange Offer or the Shelf
      Registration Statement, the Company shall use its best efforts to reflect
      in each such document, when so filed with the Commission, such comments as
      such Initial Purchaser reasonably may propose; (ii) include the
      information set forth in Annex A hereto on the cover, in Annex B hereto in
      the "Exchange Offer Procedures" section and the "Purpose of the Exchange
      Offer" section and in Annex C hereto in the "Plan of Distribution" section
      of the prospectus forming a part of the Exchange Offer Registration
      Statement and include the information set forth in Annex D hereto in the
      Letter of Transmittal delivered pursuant to the Registered Exchange Offer;
      (iii) if requested by an Initial Purchaser, include the information
      required by Items 507 or 508 of Regulation S-K under the Securities Act,
      as applicable, in the prospectus forming a part of the Exchange Offer
      Registration Statement; (iv) include within the prospectus contained in
      the Exchange Offer Registration Statement a section entitled "Plan of
      Distribution," reasonably acceptable to the Initial Purchasers, which
      shall contain a summary statement of the positions taken or policies made
      by the staff of the Commission with respect to the potential "underwriter"
      status of any broker-dealer that is the beneficial owner (as defined in
      Rule 13d-3 under the Securities Exchange Act of 1934, as amended (the
      "EXCHANGE ACT")) of Exchange Securities received by such broker-dealer in
      the Registered Exchange Offer (a "PARTICIPATING BROKER-DEALER"), whether
      such positions or policies have been publicly disseminated by the staff of
      the Commission or such positions or policies, in the reasonable judgment
      of the Initial Purchasers based upon advice of counsel (which may be
      in-house counsel),


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      represent the prevailing views of the staff of the Commission; and (v) in
      the case of a Shelf Registration Statement, include the names of the
      Holders who propose to sell Securities pursuant to the Shelf Registration
      Statement as selling securityholders.

            (b) The Company shall give written notice to the Initial Purchasers,
      the Holders of the Securities and any Participating Broker-Dealer from
      whom the Company has received prior written notice that it will be a
      Participating Broker-Dealer in the Registered Exchange Offer (which notice
      pursuant to clauses (ii)-(v) hereof shall be accompanied by an instruction
      to suspend the use of the prospectus until the requisite changes have been
      made):

                  (i) when the Registration Statement or any amendment thereto
            has been filed with the Commission and when the Registration
            Statement or any post-effective amendment thereto has become
            effective;

                  (ii) of any request by the Commission for amendments or
            supplements to the Registration Statement or the prospectus included
            therein or for additional information;

                  (iii) of the issuance by the Commission of any stop order
            suspending the effectiveness of the Registration Statement or the
            initiation of any proceedings for that purpose;

                  (iv) of the receipt by the Company or its legal counsel of any
            notification with respect to the suspension of the qualification of
            the Securities for sale in any jurisdiction or the initiation or
            threatening of any proceeding for such purpose; and

                  (v) of the happening of any event that requires the Company to
            make changes in the Registration Statement or the prospectus in
            order that the Registration Statement or the prospectus does not
            contain an untrue statement of a material fact nor omit to state a
            material fact required to be stated therein or necessary to make the
            statements therein (in the case of the prospectus, in light of the
            circumstances under which they were made) not misleading.

            (c) The Company shall make every reasonable effort to obtain the
      withdrawal at the earliest possible time, of any order suspending the
      effectiveness of the Registration Statement.

            (d) The Company shall furnish to each Holder of Securities included
      within the coverage of the Shelf Registration, without charge, at least
      one copy of the Shelf Registration Statement and any post-effective
      amendment thereto, including financial statements and schedules, and, if
      the Holder so requests in writing, all exhibits thereto (including those,
      if any, incorporated by reference).

            (e) The Company shall deliver to each Exchanging Dealer and each
      Initial Purchaser, and to any other Holder who so requests, without
      charge, at least one copy of the Exchange Offer Registration Statement and
      any post-effective amendment thereto, including financial statements and
      schedules, and, if any Initial Purchaser or any such Holder requests, all
      exhibits thereto (including those incorporated by reference).

            (f) The Company shall, during the Shelf Registration Period, deliver
      to each Holder of Securities included within the coverage of the Shelf
      Registration, without charge, as many copies of the prospectus (including
      each preliminary prospectus) included in the Shelf Registration Statement
      and any amendment or supplement thereto as such person may reasonably
      request. The Company consents, subject to the provisions of this
      Agreement, to the use of the prospectus or any amendment or supplement
      thereto by each of the selling Holders of the Securities in connection
      with the offering and sale of the Securities covered by the prospectus, or
      any amendment or supplement thereto, included in the Shelf Registration
      Statement.

            (g) The Company shall deliver to each Initial Purchaser, any
      Exchanging Dealer, any Participating Broker-Dealer and such other persons
      required to deliver a prospectus following the Registered Exchange Offer,
      without charge, as many copies of the final prospectus included in the
      Exchange Offer Registration Statement and any amendment or supplement
      thereto as such persons may reasonably request. The Company consents,
      subject to the provisions of this Agreement, to the use of the prospectus
      or any amendment or supplement thereto by any Initial Purchaser, if
      necessary, any Participating Broker-Dealer and such other persons required
      to deliver a prospectus following the Registered Exchange Offer in
      connection with the offering and sale of the Exchange


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      Securities covered by the prospectus, or any amendment or supplement
      thereto, included in such Exchange Offer Registration Statement.

            (h) Prior to any public offering of the Securities pursuant to any
      Registration Statement the Company shall register or qualify or cooperate
      with the Holders of the Securities included therein and their respective
      counsel in connection with the registration or qualification of the
      Securities for offer and sale under the securities or "blue sky" laws of
      such states of the United States as any Holder of the Securities
      reasonably requests in writing and do any and all other acts or things
      necessary or advisable to enable the offer and sale in such jurisdictions
      of the Securities covered by such Registration Statement; PROVIDED,
      HOWEVER, that the Company shall not be required to (i) qualify generally
      to do business in any jurisdiction where it is not then so qualified or
      (ii) take any action which would subject it to general service of process
      or to taxation in any jurisdiction where it is not then so subject.

            (i) The Company shall cooperate with the Holders of the Securities
      to facilitate the timely preparation and delivery of certificates
      representing the Securities to be sold pursuant to any Registration
      Statement free of any restrictive legends and (consistent with the
      provisions of the Indenture) in such denominations and registered in such
      names as the Holders may request a reasonable period of time prior to
      sales of the Securities pursuant to such Registration Statement.

            (j) Upon the occurrence of any event contemplated by paragraphs (ii)
      through (v) of Section 3(b) above during the period for which the Company
      is required to maintain an effective Registration Statement, the Company
      shall promptly prepare and file a post-effective amendment to the
      Registration Statement or a supplement to the related prospectus and any
      other required document so that, as thereafter delivered to Holders of the
      Securities or purchasers of Securities, the prospectus will not contain an
      untrue statement of a material fact or omit to state any material fact
      required to be stated therein or necessary to make the statements therein,
      in light of the circumstances under which they were made, not misleading.
      If the Company notifies the Initial Purchasers, the Holders of the
      Securities and any known Participating Broker-Dealer in accordance with
      paragraphs (ii) through (v) of Section 3(b) above to suspend the use of
      the prospectus until the requisite changes to the prospectus have been
      made, then the Initial Purchasers, the Holders of the Securities and any
      such Participating Broker-Dealers shall suspend use of such prospectus
      (and shall keep confidential the cause of such notice for so long as such
      cause is not otherwise publicly known), and the period of effectiveness of
      the Shelf Registration Statement provided for in Section 2(b) above and
      the Exchange Offer Registration Statement provided for in Section 1 above
      shall each be extended by the number of days from and including the date
      of the giving of such notice to and including the date when the Initial
      Purchasers, the Holders of the Securities and any known Participating
      Broker-Dealer shall have received such amended or supplemented prospectus
      pursuant to this Section 3(j).

            (k) Not later than the effective date of the applicable Registration
      Statement, the Company will provide a CUSIP number for the Initial
      Securities, the Exchange Securities or the Private Exchange Securities, as
      the case may be, and provide the applicable trustee with printed
      certificates for the Initial Securities, the Exchange Securities or the
      Private Exchange Securities, as the case may be, in a form eligible for
      deposit with The Depository Trust Company.

            (l) The Company will comply with all rules and regulations of the
      Commission to the extent and so long as they are applicable to the
      Registered Exchange Offer or the Shelf Registration and will make
      generally available to its security holders (or otherwise provide in
      accordance with Section 11(a) of the Securities Act) an earnings statement
      satisfying the provisions of Section 11(a) of the Securities Act, no later
      than 45 days after the end of a 12-month period (or 90 days, if such
      period is a fiscal year) beginning with the first month of the Company's
      first fiscal quarter commencing after the effective date of the
      Registration Statement, which statement shall cover such 12-month period.

            (m) The Company shall cause the Indenture to be qualified under the
      Trust Indenture Act of 1939, as amended, in a timely manner and containing
      such changes, if any, as shall be necessary for such qualification. In the
      event that such qualification would require the appointment of a new
      trustee under the Indenture, the Company shall appoint a new trustee
      thereunder pursuant to the applicable provisions of the Indenture.

            (n) The Company may require each Holder of Securities to be sold
      pursuant to the Shelf Registration Statement to furnish to the Company
      such information regarding the Holder and the distribution of the
      Securities as the Company may from time to time reasonably require for


                                       6
<PAGE>

      inclusion in the Shelf Registration Statement, and the Company may exclude
      from such registration the Securities of any Holder that unreasonably
      fails to furnish such information within a reasonable time after receiving
      such request.

            (o) The Company shall enter into such customary agreements
      (including, if requested, an underwriting agreement in customary form) and
      take all such other action, if any, as any Holder of the Securities shall
      reasonably request in order to facilitate the disposition of the
      Securities pursuant to any Shelf Registration.

            (p) In the case of any Shelf Registration, the Company shall (i)
      make reasonably available for inspection by the Holders of the Securities,
      any underwriter participating in any disposition pursuant to the Shelf
      Registration Statement and any attorney, accountant or other agent
      retained by the Holders of the Securities or any such underwriter all
      relevant financial and other records, pertinent corporate documents and
      properties of the Company and (ii) cause the Company's officers,
      directors, employees, accountants and auditors to supply all relevant
      information reasonably requested by the Holders of the Securities or any
      such underwriter, attorney, accountant or agent in connection with the
      Shelf Registration Statement, in each case, as shall be reasonably
      necessary to enable such persons, to conduct a reasonable investigation
      within the meaning of Section 11 of the Securities Act; PROVIDED, HOWEVER,
      that the foregoing inspection and information gathering shall be
      coordinated on behalf of the Initial Purchasers by you and on behalf of
      the other parties, by one counsel designated by and on behalf of such
      other parties as described in Section 4 hereof; PROVIDED FURTHER, HOWEVER,
      that the conduct of the foregoing inspection and information gathering
      shall be subject to the execution by all persons party to such inspection
      and information gathering of a reasonable confidentiality undertaking in
      customary form with respect to confidential and proprietary information of
      the Company.

            (q) In the case of any Shelf Registration, the Company, if requested
      by any Holder of Securities covered thereby, shall cause (i) its counsel
      to deliver an opinion and updates thereof relating to the Securities in
      customary form addressed to such Holders and the managing underwriters, if
      any, thereof and dated, in the case of the initial opinion, the effective
      date of such Shelf Registration Statement (it being agreed that the
      matters to be covered by such opinion shall include, without limitation,
      the due incorporation and good standing of the Company and its
      subsidiaries; the qualification of the Company and its subsidiaries to
      transact business as foreign corporations; the due authorization,
      execution and delivery of the relevant agreement of the type referred to
      in Section 3(o) hereof; the due authorization, execution, authentication
      and issuance, and the validity and enforceability, of the applicable
      Securities; the absence of material legal or governmental proceedings
      involving the Company and its subsidiaries; the absence of governmental
      approvals required to be obtained in connection with the Shelf
      Registration Statement, the offering and sale of the applicable
      Securities, or any agreement of the type referred to in Section 3(o)
      hereof; the compliance as to form of such Shelf Registration Statement and
      any documents incorporated by reference therein and of the Indenture with
      the requirements of the Securities Act and the Trust Indenture Act,
      respectively; and, as of the date of the opinion and as of the effective
      date of the Shelf Registration Statement or most recent post-effective
      amendment thereto, as the case may be, the absence from such Shelf
      Registration Statement and the prospectus included therein, as then
      amended or supplemented, and from any documents incorporated by reference
      therein of an untrue statement of a material fact or the omission to state
      therein a material fact required to be stated therein or necessary to make
      the statements therein not misleading (in the case of any such documents,
      in light of the circumstances existing at the time that such documents
      were filed with the Commission under the Exchange Act); (ii) its officers
      to execute and deliver all customary documents and certificates and
      updates thereof requested by any underwriters of the applicable Securities
      and (iii) its independent public accountants to provide to the selling
      Holders of the applicable Securities and any underwriter therefor a
      comfort letter in customary form and covering matters of the type
      customarily covered in comfort letters in connection with primary
      underwritten offerings, subject to receipt of appropriate documentation as
      contemplated, and only if permitted, by Statement of Auditing Standards
      No. 72 (and any other applicable pronouncements).

            (r) In the case of the Registered Exchange Offer, if requested by
      any Initial Purchaser or any known Participating Broker-Dealer, the
      Company shall cause (i) its counsel to deliver to such Initial Purchaser
      or such Participating Broker-Dealer a signed opinion or opinions in the
      form set forth in Section 6(c) of the Purchase Agreement with such changes
      as are customary in connection with the preparation of a Registration
      Statement and (ii) its independent public accountants to deliver to such
      Initial Purchaser or such Participating Broker-Dealer a comfort letter, in
      customary


                                       7
<PAGE>

      form, meeting the requirements as to the substance thereof as set forth in
      Section 6(a) of the Purchase Agreement, with appropriate date changes.

            (s) If a Registered Exchange Offer or a Private Exchange is to be
      consummated, upon delivery of the Initial Securities by Holders to the
      Company (or to such other Person as directed by the Company) in exchange
      for the Exchange Securities or the Private Exchange Securities, as the
      case may be, the Company shall mark, or caused to be marked, on the
      Initial Securities so exchanged that such Initial Securities are being
      canceled in exchange for the Exchange Securities or the Private Exchange
      Securities, as the case may be; in no event shall the Initial Securities
      be marked as paid or otherwise satisfied.

            (t) The Company will use its best efforts to (a) if the Initial
      Securities have been rated prior to the initial sale of such Initial
      Securities, confirm such ratings will apply to the Securities covered by a
      Registration Statement, or (b) if the Initial Securities were not
      previously rated, cause the Securities covered by a Registration Statement
      to be rated with the appropriate rating agencies, if so requested by
      Holders of a majority in aggregate principal amount of Securities covered
      by such Registration Statement, or by the managing underwriters, if any.

            (u) In the event that any broker-dealer registered under the
      Exchange Act shall underwrite any Securities or participate as a member of
      an underwriting syndicate or selling group or "assist in the distribution"
      (within the meaning of the Conduct Rules (the "RULES") of the National
      Association of Securities Dealers, Inc. ("NASD")) thereof, whether as a
      Holder of such Securities or as an underwriter, a placement or sales agent
      or a broker or dealer in respect thereof, or otherwise, the Company will
      assist such broker-dealer in complying with the requirements of such
      Rules, including, without limitation, by (i) if such Rules, including Rule
      2720, shall so require, engaging a "qualified independent underwriter" (as
      defined in Rule 2720) to participate in the preparation of the
      Registration Statement relating to such Securities, to exercise usual
      standards of due diligence in respect thereto and, if any portion of the
      offering contemplated by such Registration Statement is an underwritten
      offering or is made through a placement or sales agent, to recommend the
      yield of such Securities, (ii) indemnifying any such qualified independent
      underwriter to the extent of the indemnification of underwriters provided
      in Section 5 hereof and (iii) providing such information to such
      broker-dealer as may be required in order for such broker-dealer to comply
      with the requirements of the Rules.

            (v) The Company shall use its best efforts to take all other steps
      necessary to effect the registration of the Securities covered by a
      Registration Statement contemplated hereby.

      4. REGISTRATION EXPENSES. The Company shall bear all fees and expenses
incurred in connection with the performance of its obligations under Sections 1
through 3 hereof, whether or not the Registered Exchange Offer or a Shelf
Registration is filed or becomes effective, and, in the event of a Shelf
Registration, shall bear or reimburse the Holders of the Securities covered
thereby for the reasonable fees and disbursements of one firm of counsel
designated by the Holders of a majority in principal amount of the Securities
covered thereby to act as counsel for the Holders of the Securities in
connection therewith.

      5. INDEMNIFICATION. (a) The Company agrees to indemnify and hold harmless
each Holder of the Securities, any Participating Broker-Dealer and each person,
if any, who controls such Holder or such Participating Broker-Dealer within the
meaning of the Securities Act or the Exchange Act (each Holder, any
Participating Broker-Dealer and such controlling persons are referred to
collectively as the "INDEMNIFIED PARTIES") from and against any losses, claims,
damages or liabilities, joint or several, or any actions in respect thereof
(including, but not limited to, any losses, claims, damages, liabilities or
actions relating to purchases and sales of the Securities) to which each
Indemnified Party may become subject under the Securities Act, the Exchange Act
or otherwise, insofar as such losses, claims, damages, liabilities or actions
arise out of or are based upon any untrue statement or alleged untrue statement
of a material fact contained in a Registration Statement or prospectus or in any
amendment or supplement thereto or in any preliminary prospectus relating to a
Shelf Registration, or arise out of, or are based upon, the omission or alleged
omission to state therein a material fact required to be stated therein or
necessary to make the statements therein not misleading, and shall reimburse, as
incurred, the Indemnified Parties for any legal or other expenses reasonably
incurred by them in connection with investigating or defending any such loss,
claim, damage, liability or action in respect thereof; PROVIDED, HOWEVER, that
(i) the Company shall not be liable in any such case to the extent that such
loss, claim, damage or liability arises out of or is based upon any untrue
statement or alleged untrue statement or omission or alleged omission made in a
Registration Statement or prospectus or in any amendment or supplement thereto
or in any preliminary prospectus relating to a Shelf Registration in reliance
upon and in conformity with written information pertaining to such Holder and
furnished to the Company by or on behalf of such Holder specifically for
inclusion therein


                                       8
<PAGE>

and (ii) with respect to any untrue statement or omission or alleged untrue
statement or omission made in any preliminary prospectus relating to a Shelf
Registration Statement, the indemnity agreement contained in this subsection (a)
shall not inure to the benefit of any Holder or Participating Broker-Dealer from
whom the person asserting any such losses, claims, damages or liabilities
purchased the Securities concerned, to the extent that a prospectus relating to
such Securities was required to be delivered by such Holder or Participating
Broker-Dealer under the Securities Act in connection with such purchase and any
such loss, claim, damage or liability of such Holder or Participating
Broker-Dealer results from the fact that there was not sent or given to such
person, at or prior to the written confirmation of the sale of such Securities
to such person, a copy of the final prospectus if the Company had previously
furnished copies thereof to such Holder or Participating Broker-Dealer; PROVIDED
FURTHER, HOWEVER, that this indemnity agreement will be in addition to any
liability which the Company may otherwise have to such Indemnified Party. The
Company shall also indemnify underwriters, their officers and directors and each
person who controls such underwriters within the meaning of the Securities Act
or the Exchange Act to the same extent as provided above with respect to the
indemnification of the Holders of the Securities if requested by such Holders.

      (b) Each Holder of the Securities, severally and not jointly, will
indemnify and hold harmless the Company and each person, if any, who controls
the Company within the meaning of the Securities Act or the Exchange Act from
and against any losses, claims, damages or liabilities or any actions in respect
thereof, to which the Company or any such controlling person may become subject
under the Securities Act, the Exchange Act or otherwise, insofar as such losses,
claims, damages, liabilities or actions arise out of or are based upon any
untrue statement or alleged untrue statement of a material fact contained in a
Registration Statement or prospectus or in any amendment or supplement thereto
or in any preliminary prospectus relating to a Shelf Registration, or arise out
of or are based upon the omission or alleged omission to state therein a
material fact necessary to make the statements therein not misleading, but in
each case only to the extent that the untrue statement or omission or alleged
untrue statement or omission was made in reliance upon and in conformity with
written information pertaining to such Holder and furnished to the Company by or
on behalf of such Holder specifically for inclusion therein; and, subject to the
limitation set forth immediately preceding this clause, shall reimburse, as
incurred, the Company for any legal or other expenses reasonably incurred by the
Company or any such controlling person in connection with investigating or
defending any loss, claim, damage, liability or action in respect thereof. This
indemnity agreement will be in addition to any liability which such Holder may
otherwise have to the Company or any of its controlling persons.

      (c) Promptly after receipt by an indemnified party under this Section 5 of
notice of the commencement of any action or proceeding (including a governmental
investigation), such indemnified party will, if a claim in respect thereof is to
be made against the indemnifying party under this Section 5, notify the
indemnifying party of the commencement thereof; but the omission so to notify
the indemnifying party (i) will not relieve it from any liability under
subsection (a) or (b) above unless and to the extent it did not otherwise learn
of such action and such failure results in the forfeiture by the Indemnifying
Party of substantial rights and defenses and (ii) will not, in any event,
relieve the indemnifying party from any obligations to any indemnified party
other than the indemnification obligation provided in paragraph (a) or (b)
above. In case any such action is brought against any indemnified party, and it
notifies the indemnifying party of the commencement thereof, the indemnifying
party will be entitled to participate therein and, to the extent that it may
wish, jointly with any other indemnifying party similarly notified, to assume
the defense thereof, with counsel reasonably satisfactory to such indemnified
party (who shall not, except with the consent of the indemnified party, be
counsel to the indemnifying party), and after notice from the indemnifying party
to such indemnified party of its election so to assume the defense thereof the
indemnifying party will not be liable to such indemnified party under this
Section 5 for any legal or other expenses, other than reasonable costs of
investigation, subsequently incurred by such indemnified party in connection
with the defense thereof. No indemnifying party shall, without the prior written
consent of the indemnified party, effect any settlement of any pending or
threatened action in respect of which any indemnified party is or could have
been a party and indemnity could have been sought hereunder by such indemnified
party unless such settlement includes an unconditional release of such
indemnified party from all liability on any claims that are the subject matter
of such action and does not include a statement as to any admission of fault,
culpability or failure to act by or on behalf of any Indemnified Party.

      (d) If the indemnification provided for in this Section 5 is unavailable
or insufficient to hold harmless an indemnified party under subsections (a) or
(b) above, then each indemnifying party shall contribute to the amount paid or
payable by such indemnified party as a result of the losses, claims, damages or
liabilities (or actions in respect thereof) referred to in subsection (a) or (b)
above (i) in such proportion as is appropriate to reflect the relative benefits
received by the indemnifying party or parties on the one hand and the
indemnified party on the other from the exchange of the Securities, pursuant to
the Registered Exchange Offer, or (ii) if the allocation provided by the
foregoing clause (i) is not permitted by


                                       9
<PAGE>

applicable law, in such proportion as is appropriate to reflect not only the
relative benefits referred to in clause (i) above but also the relative fault of
the indemnifying party or parties on the one hand and the indemnified party on
the other in connection with the statements or omissions that resulted in such
losses, claims, damages or liabilities (or actions in respect thereof) as well
as any other relevant equitable considerations. The relative fault of the
parties shall be determined by reference to, among other things, whether the
untrue or alleged untrue statement of a material fact or the omission or alleged
omission to state a material fact relates to information supplied by the Company
on the one hand or such Holder or such other indemnified party, as the case may
be, on the other, and the parties' relative intent, knowledge, access to
information and opportunity to correct or prevent such statement or omission.
The amount paid by an indemnified party as a result of the losses, claims,
damages or liabilities referred to in the first sentence of this subsection (d)
shall be deemed to include any legal or other expenses reasonably incurred by
such indemnified party in connection with investigating or defending any action
or claim which is the subject of this subsection (d). Notwithstanding any other
provision of this Section 5(d), the Holders of the Securities shall not be
required to contribute any amount in excess of the amount by which the net
proceeds received by such Holders from the sale of the Securities pursuant to a
Registration Statement exceeds the amount of damages which such Holders have
otherwise been required to pay by reason of such untrue or alleged untrue
statement or omission or alleged omission. No person guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the Securities Act)
shall be entitled to contribution from any person who was not guilty of such
fraudulent misrepresentation. For purposes of this paragraph (d), each person,
if any, who controls such indemnified party within the meaning of the Securities
Act or the Exchange Act shall have the same rights to contribution as such
indemnified party and each person, if any, who controls the Company within the
meaning of the Securities Act or the Exchange Act shall have the same rights to
contribution as the Company.

      (e) The agreements contained in this Section 5 shall survive the sale of
the Securities pursuant to a Registration Statement and shall remain in full
force and effect, regardless of any termination or cancellation of this
Agreement or any investigation made by or on behalf of any indemnified party.

      6. ADDITIONAL INTEREST UNDER CERTAIN CIRCUMSTANCES. (a) Additional
interest (the "Additional Interest") with respect to the Initial Securities and
the Private Exchange Securities shall be assessed as follows if any of the
following events occur (each such event in clauses (i) through (iii) below a
"Registration Default"):

            (i) If, on August 9, 1999 (90 days after the issue date of the
      Initial Securities), neither the Exchange Offer Registration Statement nor
      a Shelf Registration Statement has been filed with the Commission;

            (ii) If, on November 8, 1999 (180 days after the issue date of the
      Initial Securities), neither the Registered Exchange Offer is consummated
      with respect to all Initial Securities tendered as of such date nor, if
      required in lieu thereof, the Shelf Registration Statement is declared
      effective by the Commission; or

            (iii) If after November 8, 1999, and after either the Exchange Offer
      Registration Statement or the Shelf Registration Statement is declared
      effective (A) such Registration Statement thereafter ceases to be
      effective, except, in the case of the Exchange Offer Registration
      Statement, following the consummation of the Exchange Offer with respect
      to all Securities tendered in connection therewith prior to the expiration
      of the Exchange Offer or (B) such Registration Statement or the related
      prospectus ceases to be usable in connection with resales of Transfer
      Restricted Securities during the periods specified herein because either
      (1) any event occurs as a result of which the related prospectus forming
      part of such Registration Statement would include any untrue statement of
      a material fact or omit to state any material fact necessary to make the
      statements therein in the light of the circumstances under which they were
      made not misleading, or (2) it shall be necessary to amend such
      Registration Statement or supplement the related prospectus, to comply
      with the Securities Act or the Exchange Act or the respective rules
      thereunder.

Additional Interest shall accrue on the Initial Securities and the Private
Exchange Notes over and above the interest set forth in the title of the
Securities from and including the date on which any such Registration Default
shall occur to but excluding the date on which all such Registration Defaults
have been cured, at a rate of 0.50% per annum (the "ADDITIONAL INTEREST RATE")
for the first 90-day period immediately following the occurrence of such
Registration Default. The Additional Interest Rate shall increase by an
additional 0.50% per annum with respect to each subsequent 90-day period until
all Registration Defaults have been cured, up to a maximum Additional Interest
Rate of 2.0% per annum.


                                       10
<PAGE>

      (b) A Registration Default referred to in Section 6(a)(iii) hereof shall
be deemed not to have occurred and be continuing in relation to a Shelf
Registration Statement or the related prospectus if (i) such Registration
Default has occurred solely as a result of (x) the filing of a post-effective
amendment to such Shelf Registration Statement to incorporate annual audited
financial information with respect to the Company where such post-effective
amendment is not yet effective and needs to be declared effective to permit
Holders to use the related prospectus or (y) other material events, with respect
to the Company that would need to be described in such Shelf Registration
Statement or the related prospectus and (ii) in the case of clause (y), the
Company is proceeding promptly and in good faith to amend or supplement such
Shelf Registration Statement and related prospectus to describe such events;
PROVIDED, HOWEVER, that in any case if such Registration Default occurs for a
continuous period in excess of 45 days, Additional Interest shall be payable in
accordance with the above paragraph from the day such Registration Default
occurs until such Registration Default is cured.

      (c) Any amounts of Additional Interest due pursuant to clause (i), (ii) or
(iii) of Section 6(a) above will be payable in cash on the regular interest
payment dates with respect to the Securities. The amount of Additional Interest
will be determined by multiplying the applicable Additional Interest rate by the
principal amount of the Initial Securities or Private Exchange Notes, as the
case may be, multiplied by a fraction, the numerator of which is the number of
days such Additional Interest rate was applicable during such period (determined
on the basis of a 360-day year comprised of twelve 30-day months), and the
denominator of which is 360.

      (d) "TRANSFER RESTRICTED SECURITIES" means each Security until (i) the
date on which such Security has been exchanged by a person other than a
broker-dealer for a freely transferable Exchange Security in the Registered
Exchange Offer, (ii) following the exchange by a broker-dealer in the Registered
Exchange Offer of an Initial Security for an Exchange Note, the date on which
such Exchange Note is sold to a purchaser who receives from such broker-dealer
on or prior to the date of such sale a copy of the prospectus contained in the
Exchange Offer Registration Statement, (iii) the date on which such Security has
been effectively registered under the Securities Act and disposed of in
accordance with the Shelf Registration Statement or (iv) the date on which such
Security is distributed to the public pursuant to Rule 144 under the Securities
Act or is saleable pursuant to Rule 144(k) under the Securities Act.

      7. RULES 144 AND 144A. The Company shall use its best efforts to file the
reports required to be filed by it under the Securities Act and the Exchange Act
in a timely manner and, if at any time the Company is not required to file such
reports, it will, upon the request of any Holder of Securities that are
"restricted securities" within the meaning of Rule 144 and are not saleable
pursuant to Rule 144(k), make publicly available other information so long as
necessary to permit sales of their securities pursuant to Rules 144 and 144A.
The Company covenants that it will take such further action as any Holder of
Securities may reasonably request, all to the extent required from time to time
to enable such Holder to sell Securities without registration under the
Securities Act within the limitation of the exemptions provided by Rules 144 and
144A (including the requirements of Rule 144A(d)(4)). The Company will provide a
copy of this Agreement to prospective purchasers of Initial Securities
identified to the Company by the Initial Purchasers upon request. Upon the
request of any Holder of Initial Securities, the Company shall deliver to such
Holder a written statement as to whether it has complied with such requirements.
Notwithstanding the foregoing, nothing in this Section 7 shall be deemed to
require the Company to register any of its securities pursuant to the Exchange
Act.

      8. UNDERWRITTEN REGISTRATIONS. If any of the Transfer Restricted
Securities covered by any Shelf Registration are to be sold in an underwritten
offering, the investment banker or investment bankers and manager or managers
that will administer the offering ("MANAGING UNDERWRITERS") will be selected by
the Holders of a majority in aggregate principal amount of such Transfer
Restricted Securities to be included in such offering, subject to approval by
the Company, which will not unreasonably be withheld or delayed.

      No person may participate in any underwritten registration hereunder
unless such person (i) agrees to sell such person's Transfer Restricted
Securities on the basis reasonably provided in any underwriting arrangements
approved by the persons entitled hereunder to approve such arrangements and (ii)
completes and executes all questionnaires, powers of attorney, indemnities,
underwriting agreements and other documents reasonably required under the terms
of such underwriting arrangements.

      9. MISCELLANEOUS.

      (a) AMENDMENTS AND WAIVERS. The provisions of this Agreement may not be
amended, modified or supplemented, and waivers or consents to departures from
the provisions hereof may not be given,


                                       11
<PAGE>

except by the Company and the written consent of the Holders of a majority in
principal amount of the Securities affected by such amendment, modification,
supplement, waiver or consents.

      (b) NOTICES. All notices and other communications provided for or
permitted hereunder shall be made in writing by hand delivery, first-class mail,
facsimile transmission, or air courier which guarantees overnight delivery:

            (1) if to a Holder of the Securities, at the most current address
given by such Holder to the Company.

            (2) if to the Initial Purchasers:

                  Credit Suisse First Boston Corporation
                  Eleven Madison Avenue
                  New York, NY 10010-3629
                  Fax No.:  (212) 325-8278
                  Attention:  Transactions Advisory Group

      with a copy to:

                  Cravath, Swaine & Moore
                  825 Eighth Avenue
                  New York, NY 10019-7475
                  Fax No.:  (212) 474-3700
                  Attention:  Stephen L. Burns, Esq.

            (3) if to the Company, at its address as follows:

                  Anteon Corporation
                  3211 Jermantown Road, Suite 700
                  Fairfax, VA 22030-2801
                  Fax No.:  (703) 246-0629
                  Attention: Curtis L. Schehr, Esq.

      with a copy to:

                  Paul, Weiss, Rifkind, Wharton & Garrison
                  1285 Avenue of the Americas
                  New York, NY 10019-6064
                  Fax No.:  (212) 757-3990
                  Attention:  Carl L. Reisner, Esq.

      All such notices and communications shall be deemed to have been duly
given: at the time delivered by hand, if personally delivered; three business
days after being deposited in the mail, postage prepaid, if mailed; when receipt
is acknowledged by recipient's facsimile machine operator, if sent by facsimile
transmission; and on the day delivered, if sent by overnight air courier
guaranteeing next day delivery.

      (c) NO INCONSISTENT AGREEMENTS. The Company has not, as of the date
hereof, entered into, nor shall it, on or after the date hereof, enter into, any
agreement with respect to its securities that is inconsistent with the rights
granted to the Holders herein or otherwise conflicts with the provisions hereof.

      (d) SUCCESSORS AND ASSIGNS. This Agreement shall be binding upon the
Company and its successors and assigns.

      (e) COUNTERPARTS. This Agreement may be executed in any number of
counterparts and by the parties hereto in separate counterparts, each of which
when so executed shall be deemed to be an original and all of which taken
together shall constitute one and the same agreement.

      (f) HEADINGS. The headings in this Agreement are for convenience of
reference only and shall not limit or otherwise affect the meaning hereof.


                                       12
<PAGE>

      (g) GOVERNING LAW. THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK WITHOUT REGARD TO PRINCIPLES
OF CONFLICTS OF LAWS.

      (h) SEVERABILITY. If any one or more of the provisions contained herein,
or the application thereof in any circumstance, is held invalid, illegal or
unenforceable, the validity, legality and enforceability of any such provision
in every other respect and of the remaining provisions contained herein shall
not be affected or impaired thereby.

      (i) SECURITIES HELD BY THE COMPANY. Whenever the consent or approval of
Holders of a specified percentage of principal amount of Securities is required
hereunder, Securities held by the Company or its affiliates (other than
subsequent Holders of Securities if such subsequent Holders are deemed to be
affiliates solely by reason of their holdings of such Securities) shall not be
counted in determining whether such consent or approval was given by the Holders
of such required percentage.


                                       13
<PAGE>

      If the foregoing is in accordance with your understanding of our
agreement, please sign and return to the Issuer a counterpart hereof, whereupon
this instrument, along with all counterparts, will become a binding agreement
among the Initial Purchasers and the Issuer and the Guarantors in accordance
with its terms.

                                    Very truly yours,

                                    ANTEON CORPORATION,


                                    by
                                       -------------------------------------
                                       Name:
                                       Title:


                                    VECTOR DATA SYSTEMS, INC.,


                                    by
                                       -------------------------------------
                                       Name:
                                       Title:


                                    TECHMATICS, INC.,


                                    by
                                       -------------------------------------
                                       Name:
                                       Title:


The foregoing Registration
Rights Agreement is hereby confirmed
and accepted as of the date first
above written.

CREDIT SUISSE FIRST BOSTON CORPORATION
DEUTSCHE BANK SECURITIES INC.
LEGG MASON WOOD WALKER, INCORPORATED

Acting on behalf of itself and as the Representative of the several Initial
Purchasers.

by: CREDIT SUISSE FIRST BOSTON CORPORATION

    by
       -------------------------------------
       Name:
       Title:


                                       14
<PAGE>

                                                                         ANNEX A

      Each broker-dealer that receives Exchange Securities for its own account
pursuant to the Exchange Offer must acknowledge that it will deliver a
prospectus in connection with any resale of such Exchange Securities. The Letter
of Transmittal states that by so acknowledging and by delivering a prospectus, a
broker-dealer will not be deemed to admit that it is an "underwriter" within the
meaning of the Securities Act. This Prospectus, as it may be amended or
supplemented from time to time, may be used by a broker-dealer in connection
with resales of Exchange Securities received in exchange for Initial Securities
where such Initial Securities were acquired by such broker-dealer as a result of
market-making activities or other trading activities. The Company has agreed
that, for a period of 180 days after the Expiration Date (as defined herein), it
will make this Prospectus available to any broker-dealer for use in connection
with any such resale. See "Plan of Distribution."


                                       15
<PAGE>

                                                                         ANNEX B

      Each broker-dealer that receives Exchange Securities for its own account
in exchange for Initial Securities, where such Initial Securities were acquired
by such broker-dealer as a result of market-making activities or other trading
activities, must acknowledge that it will deliver a prospectus in connection
with any resale of such Exchange Securities. See "Plan of Distribution."


                                       16
<PAGE>

                                                                         ANNEX C

                              PLAN OF DISTRIBUTION

      Each broker-dealer that receives Exchange Securities for its own account
pursuant to the Exchange Offer must acknowledge that it will deliver a
prospectus in connection with any resale of such Exchange Securities. This
Prospectus, as it may be amended or supplemented from time to time, may be used
by a broker-dealer in connection with resales of Exchange Securities received in
exchange for Initial Securities where such Initial Securities were acquired as a
result of market-making activities or other trading activities. The Company has
agreed that, for a period of 180 days after the Expiration Date, it will make
this prospectus, as amended or supplemented, available to any broker-dealer for
use in connection with any such resale. In addition, until _____, 1999, all
dealers effecting transactions in the Exchange Securities may be required to
deliver a prospectus.(1)

      The Company will not receive any proceeds from any sale of Exchange
Securities by broker-dealers. Exchange Securities received by broker-dealers for
their own account pursuant to the Exchange Offer may be sold from time to time
in one or more transactions in the over-the-counter market, in negotiated
transactions, through the writing of options on the Exchange Securities or a
combination of such methods of resale, at market prices prevailing at the time
of resale, at prices related to such prevailing market prices or negotiated
prices. Any such resale may be made directly to purchasers or to or through
brokers or dealers who may receive compensation in the form of commissions or
concessions from any such broker-dealer or the purchasers of any such Exchange
Securities. Any broker-dealer that resells Exchange Securities that were
received by it for its own account pursuant to the Exchange Offer and any broker
or dealer that participates in a distribution of such Exchange Securities may be
deemed to be an "underwriter" within the meaning of the Securities Act and any
profit on any such resale of Exchange Securities and any commission or
concessions received by any such persons may be deemed to be underwriting
compensation under the Securities Act. The Letter of Transmittal states that, by
acknowledging that it will deliver and by delivering a prospectus, a
broker-dealer will not be deemed to admit that it is an "underwriter" within the
meaning of the Securities Act.

      For a period of 180 days after the Expiration Date the Company will
promptly send additional copies of this Prospectus and any amendment or
supplement to this Prospectus to any broker-dealer that requests such documents
in the Letter of Transmittal. The Company has agreed to pay all expenses
incident to the Exchange Offer (including the expenses of one counsel for the
Holders of the Securities) other than commissions or concessions of any brokers
or dealers and will indemnify the Holders of the Securities (including any
broker-dealers) against certain liabilities, including liabilities under the
Securities Act.


----------
(1)   In addition, the legend required by Item 502(e) of Regulation S-K will
      appear on the back cover page of the Exchange Offer prospectus.


                                       17
<PAGE>

                                                                         ANNEX D

|_| CHECK HERE IF YOU ARE A BROKER-DEALER AND WISH TO RECEIVE 10 ADDITIONAL
COPIES OF THE PROSPECTUS AND 10 COPIES OF ANY AMENDMENTS OR SUPPLEMENTS THERETO.

        Name:    ____________________________________
        Address: ____________________________________
                 ____________________________________

If the undersigned is not a broker-dealer, the undersigned represents that it is
not engaged in, and does not intend to engage in, a distribution of Exchange
Securities. If the undersigned is a broker-dealer that will receive Exchange
Securities for its own account in exchange for Initial Securities that were
acquired as a result of market-making activities or other trading activities, it
acknowledges that it will deliver a prospectus in connection with any resale of
such Exchange Securities; however, by so acknowledging and by delivering a
prospectus, the undersigned will not be deemed to admit that it is an
"underwriter" within the meaning of the Securities Act.


                                       18
