
<PAGE>
                             LETTER OF TRANSMITTAL

                               ANTEON CORPORATION

                     OFFER TO EXCHANGE $100,000,000 OF ITS
                     12% SENIOR SUBORDINATED NOTES DUE 2009
                             (THE "EXCHANGE NOTES")
    WHICH HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED,
                      FOR $100,000,000 OF ITS OUTSTANDING
                     12% SENIOR SUBORDINATED NOTES DUE 2009
                             (THE "INITIAL NOTES")
              PURSUANT TO THE PROSPECTUS, DATED             , 1999

     THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME, ON
           , 1999 OR SUCH LATER DATE AND TIME TO WHICH THE EXCHANGE OFFER MAY BE
EXTENDED (THE "EXPIRATION DATE").

                  The Exchange Agent for the Exchange Offer is:

                       IBJ WHITEHALL BANK & TRUST COMPANY
                        BY REGISTERED OR CERTIFIED MAIL:
                       IBJ Whitehall Bank & Trust Company
                                  P.O. Box 84
                             Bowling Green Station
                            New York, NY 10274-0084
                   Attn: Reorganization Operations Department

                         BY HAND OR OVERNIGHT DELIVERY:
                       IBJ Whitehall Bank & Trust Company
                                One State Street
                               New York, NY 10004
           Attn: Securities Processing Window, Subcellar One, (SC-1)

                     BY FACSIMILE FOR ELIGIBLE INSTITUTIONS:
                                 (212) 858-2611

                    FOR CONFIRMATION AND/OR INFORMATION CALL:
                                 (212) 858-2103

 DELIVERY OF THIS LETTER OF TRANSMITTAL TO AN ADDRESS OTHER THAN AS SET FORTH
ABOVE OR TRANSMISSION OF INSTRUCTIONS VIA FACSIMILE OTHER THAN AS SET FORTH
ABOVE DOES NOT CONSTITUTE A VALID DELIVERY.

                  PLEASE READ THIS ENTIRE LETTER OF TRANSMITTAL
                   CAREFULLY BEFORE COMPLETING ANY BOX BELOW

                            -------------------------
<PAGE>
    List below the Initial Notes to which this Letter of Transmittal relates. If
the space provided below is inadequate, the certificate numbers and principal
amount of Initial Notes should be listed on a separate signed schedule affixed
hereto.
<TABLE>
<CAPTION>
 -------------------------------------------------------------------------------------------
        DESCRIPTION OF INITIAL NOTES                (1)             (2)             (3)
---------------------------------------------------------------------------------------------
                                                                                 PRINCIPAL
                                                                                   AMOUNT
                                                                                 OF INITIAL
                                                                                   NOTES
    NAME(S) AND ADDRESS(ES) OF REGISTERED                        PRINCIPAL        TENDERED
                    HOLDER(S)                   CERTIFICATE      AMOUNT OF     (IF LESS THAN
         (PLEASE FILL IN, IF BLANK)              NUMBER(S)*    INITIAL NOTES       ALL)**
<S>                                            <C>             <C>             <C>
     ----------------------------------------------------------------------------------------

                                               ----------------------------------------------

                                               ----------------------------------------------

                                               ----------------------------------------------

                                               ----------------------------------------------

     ----------------------------------------------------------------------------------------

<CAPTION>
---------------------------------------------------------------------------------------------
</TABLE>

*   Need not be completed by book-entry holders.

**  Unless otherwise indicated, the holder will be deemed to have tendered the
    full aggregate principal amount represented by such Initial Notes.

    The undersigned acknowledges that he or she has received and reviewed the
Prospectus, dated             , 1999 (the "Prospectus"), of Anteon Corporation,
a Virginia corporation (the "Company"), and this Letter of Transmittal (the
"Letter of Transmittal" or this "Letter"), which together constitute the
Company's offer (the "Exchange Offer") to exchange up to $100,000,000 aggregate
principal amount of its 12% Senior Subordinated Notes due 2009 (the "Exchange
Notes") for a like principal amount of the Company's issued and outstanding 12%
Senior Subordinated Notes due 2009 (collectively, the "Initial Notes").

    The undersigned has completed the appropriate boxes above and below and
signed this Letter to indicate the action the undersigned desires to take with
respect to the Exchange Offer.

    This Letter is to be used either if certificates of Initial Notes are to be
forwarded herewith or if delivery of Initial Notes is to be made by book-entry
transfer to an account maintained by the Exchange Agent at The Depository Trust
Company, pursuant to the procedures set forth in "The Exchange Offer--
Procedures for Tendering Initial Notes" in the Prospectus. Delivery of this
Letter and any other required documents should be made to the Exchange Agent.
Delivery of documents to a book-entry transfer facility does not constitute
delivery to the Exchange Agent.

    Holders whose Initial Notes are not immediately available or who cannot
deliver their Initial Notes and all other documents required hereby to the
Exchange Agent on or prior to the Expiration Date must tender their Initial
Notes according to the guaranteed delivery procedure set forth in the Prospectus
under the caption "The Exchange Offer--Procedures for Tendering Initial
Notes--Guaranteed Delivery Procedure." See Instruction 1.

    / /CHECK HERE IF INITIAL NOTES ARE BEING DELIVERED BY BOOK-ENTRY TRANSFER
       MADE TO AN ACCOUNT MAINTAINED BY THE EXCHANGE AGENT WITH THE BOOK-ENTRY
       TRANSFER FACILITY AND COMPLETE THE FOLLOWING:

Name of Tendering Institution _________________ / / The Depository Trust Company
Account Number _________________________________________________________________

Transaction Code Number ________________________________________________________

                                       2
<PAGE>
/ /CHECK HERE IF INITIAL NOTES ARE BEING DELIVERED PURSUANT TO A NOTICE OF
   GUARANTEED DELIVERY AND COMPLETE THE FOLLOWING:

Name of Registered Holder(s) ___________________________________________________

Name of Eligible Institution that Guaranteed Delivery __________________________

If delivered by book-entry transfer:

Account Number _________________________________________________________________

Date of execution of Notice of Guaranteed Delivery _____________________________

/ /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 acquiring the Exchange Notes in the ordinary course of business of the
undersigned, that it is not engaged in, and does not intend to engage in, or has
no arrangement or understanding with any person to participate in, a
distribution of Exchange Notes and that it is not an "affiliate" of the Company
within the meaning of Rule 405 under the Securities Act of 1933, as amended (the
"Securities Act"). If the undersigned is a broker-dealer that will receive
Exchange Notes for its own account in exchange for Initial Notes that were
acquired as a result of market-making activities or other trading activities, it
may be deemed to be an "underwriter" within the meaning of the Securities Act
and must acknowledge that it will deliver a prospectus meeting the requirements
of the Securities Act in connection with any resale of such Exchange Notes;
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.

                                       3
<PAGE>
              PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY

Ladies and Gentlemen:

    Upon the terms and subject to the conditions of the Exchange Offer, the
undersigned hereby tenders to the Company the aggregate principal amount of
Initial Notes indicated above. Subject to, and effective upon, the acceptance
for exchange of the Initial Notes tendered hereby, the undersigned hereby sells,
assigns and transfers to, or upon the order of, the Company all right, title and
interest in and to such Initial Notes as are being tendered hereby.

    The undersigned hereby represents and warrants that the undersigned has full
power and authority to tender, sell, assign and transfer the Initial Notes
tendered hereby and that the Company will acquire good and unencumbered title
thereto, free and clear of all liens, restrictions, charges and encumbrances and
not subject to any adverse claim when the same are accepted by the Company. The
undersigned will, upon request, execute and deliver any additional documents
deemed by the Company or the Exchange Agent to be necessary or desirable to
complete the sale, assignment and transfer of the Initial Notes tendered hereby.

    The undersigned also acknowledges that this Exchange Offer is being made in
reliance on the Company's belief, based on interpretations by the staff of the
Securities and Exchange Commission (the "SEC") to third parties in unrelated
transactions, that the Exchange Notes issued in exchange for the Initial Notes
pursuant to the Exchange Offer may be offered for resale, resold and otherwise
transferred by holders thereof (other than (i) any such holder that is an
"affiliate" of the Company within the meaning of Rule 405 under the Securities
Act or (ii) any broker-dealer that purchases Notes from the Company to resell
pursuant to Rule 144A under the Securities Act ("Rule 144A") or any other
available exemption) without compliance with the registration and prospectus
delivery provisions of the Securities Act, provided that such Exchange Notes are
acquired in the ordinary course of such holders' business and such holders have
no arrangement or understanding with any person to participate in the
distribution of such Exchange Notes and are not participating in, and do not
intend to participate in, the distribution of such Exchange Notes. The
undersigned acknowledges that any holder of Initial Notes using the Exchange
Offer to participate in a distribution of the Exchange Notes (i) cannot rely on
the position of the staff of the SEC enunciated in its interpretive letter with
respect to Exxon Capital Holdings Corporation (available April 13, 1989) or
similar letters and (ii) must comply with the registration and prospectus
requirements of the Securities Act in connection with a secondary resale
transaction.

    The undersigned represents that (i) the Exchange Notes acquired pursuant to
the Exchange Offer are being obtained in the ordinary course of business of the
person receiving such Exchange Notes, whether or not such person is the holder,
(ii) such holder or such other person has no arrangement or understanding with
any person to participate in the distribution of such Exchange Notes within the
meaning of the Securities Act and is not participating in, and does not intend
to participate in, the distribution of such Exchange Notes within the meaning of
the Securities Act, and (iii) such holder or such other person is not an
"affiliate," as defined in Rule 405 under the Securities Act, of the Company or,
if such holder or such other person is an affiliate, such holder or such other
person will comply with the registration and prospectus delivery requirements of
the Securities Act to the extent applicable.

    The undersigned, if a California resident, hereby further represents and
warrants that the undersigned (or the beneficial owner of the Initial Notes
tendered hereby, if not the undersigned) (i) is a bank, savings and loan
association, trust company, insurance company, investment company registered
under the Investment Company Act of 1940, pension or profit-sharing trust (other
than a pension or profit-sharing trust of the Company, a self-employed
individual retirement plan, or individual retirement account), or a corporation
which has a net worth on a consolidated basis according to its most recent
audited financial statement of not less than $14,000,000, and (ii) is acquiring
the Exchange Notes for its own account for

                                       4
<PAGE>
investment purposes (or for the account of the beneficial owner of such Exchange
Notes for investment purposes).

    All authority conferred or agreed to be conferred in this Letter and every
obligation of the undersigned hereunder shall be binding upon the successors,
assigns, heirs, executors, administrators, trustees in bankruptcy and legal
representatives of the undersigned and shall not be affected by, and shall
survive, the death or incapacity of the undersigned. This tender may be
withdrawn only in accordance with the procedures set forth in the instructions
contained in this Letter.

    The undersigned understands that tenders of the Initial Notes pursuant to
any one of the procedures described under "The Exchange Offer--Procedures for
Tendering Initial Notes" in the Prospectus and in the instructions hereto will
constitute a binding agreement between the undersigned and the Company in
accordance with the terms and subject to the conditions of the Exchange Offer.

    The undersigned recognizes that, under certain circumstances set forth in
the Prospectus under "The Exchange Offer--Conditions to the Exchange Offer," the
Company may not be required to accept for exchange any of the Initial Notes
tendered. Initial Notes not accepted for exchange or withdrawn will be returned
to the undersigned at the address set forth below unless otherwise indicated
under "Special Delivery Instructions" below.

    Unless otherwise indicated herein in the box entitled "Special Issuance
Instructions" below, please issue the Exchange Notes (and, if applicable,
substitute certificates representing Initial Notes for any Initial Notes not
exchanged) in the name of the undersigned. Similarly, unless otherwise indicated
under the box entitled "Special Delivery Instructions" below, please deliver the
Exchange Notes (and, if applicable, substitute certificates representing Initial
Notes for any Initial Notes not exchanged) to the undersigned at the address
shown above in the box entitled "Description of Initial Notes."

    THE BOOK-ENTRY TRANSFER FACILITY, AS THE HOLDER OF RECORD OF CERTAIN INITIAL
NOTES, HAS GRANTED AUTHORITY TO BOOK-ENTRY TRANSFER FACILITY PARTICIPANTS WHOSE
NAMES APPEAR ON A SECURITY POSITION LISTING WITH RESPECT TO SUCH INITIAL NOTES
AS OF THE DATE OF TENDER OF SUCH INITIAL NOTES TO EXECUTE AND DELIVER THE LETTER
OF TRANSMITTAL AS IF THEY WERE THE HOLDERS OF RECORD. ACCORDINGLY, FOR PURPOSES
OF THIS LETTER OF TRANSMITTAL, THE TERM "HOLDER" SHALL BE DEEMED TO INCLUDE SUCH
BOOK-ENTRY TRANSFER FACILITY PARTICIPANTS.

    THE UNDERSIGNED, BY COMPLETING THE BOX ENTITLED "DESCRIPTION OF INITIAL
NOTES" ABOVE AND SIGNING THIS LETTER AND DELIVERING SUCH NOTES AND THIS LETTER
TO THE EXCHANGE AGENT, WILL BE DEEMED TO HAVE TENDERED THE INITIAL NOTES AS SET
FORTH IN SUCH BOX ABOVE.

                                       5
<PAGE>
                                PLEASE SIGN HERE
                   (TO BE COMPLETED BY ALL TENDERING HOLDERS)
                  (COMPLETE ACCOMPANYING SUBSTITUTE FORM W-9)

<TABLE>
<S>                                           <C>
Dated:

SIGNATURE(S) OF OWNER(S)/OR AUTHORIZED
SIGNATORY                                     DATE

Area Code and Telephone Number
</TABLE>

    If a holder is tendering any Initial Notes, this Letter must be signed by
the registered holder(s) as the name(s) appear(s) on the certificate(s) for the
Initial Notes or by any person(s) authorized to become registered holder(s) by
endorsements and documents transmitted herewith. If signature is by a trustee,
executor, administrator, guardian, officer or other person acting in a fiduciary
or representative capacity, please set forth full title. See Instruction 3.

Names __________________________________________________________________________
                                         _______________________________________
                             (PLEASE TYPE OR PRINT)

Capacity: ______________________________________________________________________
                                         _______________________________________

Address ________________________________________________________________________
                                         _______________________________________
                               (INCLUDE ZIP CODE)

                              SIGNATURE GUARANTEE
                         (IF REQUIRED BY INSTRUCTION 3)

Signature(s) Guaranteed by
an Eligible Institution: _______________________________________________________
                             (AUTHORIZED SIGNATURE)

________________________________________________________________________________
                                    (TITLE)

________________________________________________________________________________
                                 (NAME OF FIRM)

Dated: _________________________________________________________________________

                                       6
<PAGE>
-------------------------------------------
                         SPECIAL ISSUANCE INSTRUCTIONS
                           (SEE INSTRUCTIONS 3 AND 4)

      To be completed ONLY if certificates for Exchange Notes are to be issued
  in the name of and sent to someone other than the person or persons whose
  signature(s) appear on this Letter above.

  Issue:  Exchange Notes to:

  Name(s): ___________________________________________________________________
                             (PLEASE TYPE OR PRINT)

  ____________________________________________________________________________
                             (PLEASE TYPE OR PRINT)

  Address: ___________________________________________________________________

  ____________________________________________________________________________
                                                                   (ZIP CODE)

  Social Security Number: ____________________________________________________

                         (COMPLETE SUBSTITUTE FORM W-9)

------------------------------------------------------
------------------------------------------------------

                         SPECIAL DELIVERY INSTRUCTIONS
                           (SEE INSTRUCTIONS 3 AND 4)

      To be completed ONLY if certificates for Exchange Notes are to be sent
  to someone other than the person or persons whose signature(s) appear(s) on
  this Letter above or to such person or persons at an address other than
  shown in the box entitled "Description of Initial Notes" on this Letter
  above.

  Mail: Exchange Notes to:

  Name(s): ___________________________________________________________________
                             (PLEASE TYPE OR PRINT)

   __________________________________________________________________________
                             (PLEASE TYPE OR PRINT)

  Address: ___________________________________________________________________

  ____________________________________________________________________________
                                                                   (ZIP CODE)

-----------------------------------------------------

    IMPORTANT: UNLESS GUARANTEED DELIVERY PROCEDURES ARE COMPLIED WITH, THIS
LETTER OR A FACSIMILE HEREOF OR AN AGENT'S MESSAGE (IN EACH CASE, TOGETHER WITH
THE CERTIFICATE(S) FOR INITIAL NOTES OR A CONFIRMATION OF BOOK-ENTRY TRANSFER OF
SUCH INITIAL NOTES AND ALL OTHER REQUIRED DOCUMENTS) MUST BE RECEIVED BY THE
EXCHANGE AGENT PRIOR TO THE EXPIRATION DATE.

                                       7
<PAGE>
                                  INSTRUCTIONS
         FORMING PART OF THE TERMS AND CONDITIONS OF THE EXCHANGE OFFER

1.  DELIVERY OF THIS LETTER AND INITIAL NOTES; GUARANTEED DELIVERY PROCEDURE.

    This Letter is to be used to forward, and must accompany, all certificates
representing Initial Notes tendered pursuant to the Exchange Offer unless such
certificates are accompanied by an Agent's Message (as defined in the
Prospectus) in which case you need not submit this Letter to the Exchange Agent.
Certificates representing the Initial Notes in proper form for transfer (or a
confirmation of book-entry transfer of such Initial Notes into the Exchange
Agent's account at the book-entry transfer facility) must be received by the
Exchange Agent at its address set forth herein on or before the Expiration Date.
A tender will not be deemed to have been timely received when the tendering
holder's properly completed and duly signed Letter or an Agent's Message
accompanied by the Initial Notes is mailed prior to the Expiration Date but is
received by the Exchange Agent after the Expiration Date.

    THE METHOD OF DELIVERY OF THIS LETTER, THE INITIAL NOTES AND ALL OTHER
REQUIRED DOCUMENTS IS AT THE ELECTION AND RISK OF THE TENDERING HOLDERS, BUT THE
DELIVERY WILL BE DEEMED MADE ONLY WHEN ACTUALLY RECEIVED OR CONFIRMED BY THE
EXCHANGE AGENT. IF SUCH DELIVERY IS BY MAIL, IT IS RECOMMENDED THAT REGISTERED
MAIL PROPERLY INSURED, WITH RETURN RECEIPT REQUESTED, BE USED. IN ALL CASES,
SUFFICIENT TIME SHOULD BE ALLOWED TO PERMIT TIMELY DELIVERY.

    If a holder desires to tender Initial Notes and such holder's Initial Notes
are not immediately available or time will not permit such holder's Letter of
Transmittal, Initial Notes (or a confirmation of book-entry transfer of Initial
Notes into the Exchange Agent's account at the book-entry transfer facility with
an Agent's Message) or other required documents to reach the Exchange Agent on
or before the Expiration Date, such holder may still tender in the Exchange
Offer if:

        (a) the tender is made through an Eligible Institution (as defined
    below);

        (b) prior to the Expiration Date, the Exchange Agent receives from such
    Eligible Institution a properly completed and duly executed Letter of
    Transmittal (or facsimile thereof) and Notice of Guaranteed Delivery,
    substantially in the form provided by us (by facsimile transmission, mail or
    hand delivery), setting forth your name and address as holder of the Initial
    Notes and the amount of Initial Notes tendered, stating that the tender is
    being made thereby and guaranteeing that within three business days after
    the Expiration Date the certificates for all physically tendered Initial
    Notes, in proper form for transfer, or a book-entry confirmation with an
    Agent's Message, as the case may be, and any other documents required by the
    Letter of Transmittal will be deposited by the Eligible Institution with the
    Exchange Agent; and

        (c) the certificates for all physically tendered Initial Notes, in
    proper form for transfer, or a book-entry confirmation as the case may be,
    and all other documents required by this Letter of Transmittal, are received
    by the Exchange Agent within three business days after the Expiration Date.

    See "The Exchange Offer--Procedures for Tendering Initial Notes" in the
Prospectus.

2.  WITHDRAWALS.

    Any holder who has tendered Initial Notes may withdraw the tender by
delivering written notice of withdrawal (which may be sent by telegram,
facsimile (receipt confirmed by telephone and an original delivered by
guaranteed overnight courier)) to the Exchange Agent prior to the close of
business on the Expiration Date and prior to acceptance for exchange thereof by
us. For a withdrawal to be effective, a written notice of withdrawal must (i)
specify the name of the person having tendered the Initial Notes to be withdrawn
(the "Depositor"), (ii) identify the Initial Notes to be withdrawn (including
the certificate number or numbers and principal amount of such Initial Notes),
(iii) signed by the holder in the same manner as the original signature on the
Letter of Transmittal by which such Initial Notes were tendered or

                                       8
<PAGE>
as otherwise set forth in Instruction 3 below (including any required signature
guarantees), or be accompanied by documents of transfer sufficient to have the
trustee for the indenture governing the Initial Notes register the transfer of
such Initial Notes pursuant to the terms of such indenture into the name of the
person withdrawing the tender and (iv) specify the name in which any such
Initial Notes are to be registered, if different from that of the Depositor. If
Initial Notes have been tendered pursuant to the procedure for book-entry
transfer, any notice of withdrawal must specify the name and number of the
participant's account at the book-entry transfer facility to be credited, if
different from that of the Depositor, with the withdrawn Initial Notes or
otherwise comply with the book-entry transfer facility's procedures. See "The
Exchange Offer--Withdrawal of Tenders" in the Prospectus.

3.  SIGNATURES ON THIS LETTER; BOND POWERS AND ENDORSEMENTS; GUARANTEE OF
    SIGNATURES.

    If this Letter is signed by the registered holder of the Initial Notes
tendered hereby, the signature must correspond with the name as written on the
face of the certificates without alteration, enlargement or any change
whatsoever.

    If this Letter is signed by a participant in DTC, the signature must
correspond with the name as it appears on the security position listing as the
holder of the Initial Notes.

    If this Letter or any Initial Notes or bond powers are signed by trustees,
executors, administrators, guardians, attorneys-in-fact, officers of
corporations or others acting in a fiduciary or representative capacity, such
persons should so indicate when signing. Unless waived by us, evidence
satisfactory to us of their authority to so act must also be submitted with the
Letter of Transmittal.

    If any tendered Initial Notes are owned of record by two or more joint
owners, all such owners must sign this Letter.

    The signatures on this Letter or a notice of withdrawal, as the case may be,
must be guaranteed by a member firm of a registered national securities exchange
or of the National Association of Securities Dealers, Inc., a commercial bank or
trust company having an office or correspondent in the United States or an
"eligible guarantor" institution within the meaning of Rule 17Ad-15 under the
Securities Exchange Act of 1934, as amended--(each, an "Eligible Institution"),
unless the Initial Notes are tendered: (i) by a registered holder (or by a
participant in DTC whose name appears on a security position listing as the
owner) who has not completed the box entitled "Special Issuance Instructions" or
"Special Delivery Instructions" on this Letter and the Exchange Notes are being
issued directly to such registered holder (or deposited into the participant's
account at DTC), or (ii) for the account of an Eligible Institution.

4.  SPECIAL ISSUANCE AND DELIVERY INSTRUCTIONS.

    Tendering holders of Initial Notes should indicate in the applicable box the
name and address to which Exchange Notes issued pursuant to the Exchange Offer
are to be issued or sent, if different from the name or address of the person
signing this Letter. In the case of issuance in a different name, the employer
identification or social security number of the person named must also be
indicated. If no such instructions are given, any Exchange Notes will be issued
in the name of, and delivered to, the name or address of the person signing this
Letter and any Initial Notes not accepted for exchange will be returned to the
name or address of the person signing this Letter.

5.  BACKUP FEDERAL INCOME TAX WITHHOLDING AND SUBSTITUTE FORM W-9.

    Under the federal income tax laws, payments that may be made by the Company
on account of Exchange Notes issued pursuant to the Exchange Offer may be
subject to backup withholding at the rate of 31%. In order to avoid such backup
withholding, each tendering holder should complete and sign the Substitute Form
W-9 included in this Letter and either (a) provide the correct taxpayer
identification number ("TIN") and certify, under penalties of perjury, that the
TIN provided is correct and that (i) the

                                       9
<PAGE>
holder has not been notified by the Internal Revenue Service (the "IRS") that
the holder is subject to backup withholding as a result of failure to report all
interest or dividends or (ii) the IRS has notified the holder that the holder is
no longer subject to backup withholding; or (b) provide an adequate basis for
exemption. If the tendering holder has not been issued a TIN and has applied for
one, or intends to apply for one in the near future, such holder should write
"Applied For" in the space provided for the TIN in Part I of the Substitute Form
W-9, sign and date the Substitute Form W-9, and sign the Certification of Payee
Awaiting Taxpayer Identification Number. If "Applied For" is written in Part I,
the Company (or the Paying Agent under the Indenture governing the Exchange
Notes) shall retain 31% of payments made to the tendering holder during the
sixty (60) day period following the date of the Substitute Form W-9. If the
holder furnishes the Exchange Agent or the Company with his or her TIN within
sixty (60) days after the date of the Substitute Form W-9, the Company (or the
Paying Agent) shall remit such amounts retained during the sixty (60) day period
to the holder and no further amounts shall be retained or withheld from payments
made to the holder thereafter. If, however, the holder has not provided the
Exchange Agent or the Company with his or her TIN within such sixty (60) day
period, the Company (or the Paying Agent) shall remit such previously retained
amounts to the IRS as backup withholding. In general, if a holder is an
individual, the taxpayer identification number is the Social Security number of
such individual. If the Exchange Agent or the Company is not provided with the
correct taxpayer identification number, the holder may be subject to a $50
penalty imposed by the IRS. Certain holders (including, among others, all
corporations and certain foreign individuals) are not subject to these backup
withholding and reporting requirements. In order for a foreign individual to
qualify as an exempt recipient, such holder must submit a statement (generally,
IRS Form W-8), signed under penalties of perjury, attesting to that individual's
exempt status. Such statements can be obtained from the Exchange Agent. For
further information concerning backup withholding and instructions for
completing the Substitute Form W-9 (including how to obtain a taxpayer
identification number if you do not have one and how to complete the Substitute
Form W-9 if Initial Notes are registered in more than one name), consult the
enclosed Guidelines for Certification of Taxpayer Identification Number on
Substitute Form W-9.

    Failure to complete the Substitute Form W-9 will not, by itself, cause
Initial Notes to be deemed invalidly tendered, but may require the Company (or
the Paying Agent) to withhold 31% of the amount of any payments made on account
of the Exchange Notes. Backup withholding is not an additional federal income
tax. Rather, the federal income tax liability of a person subject to backup
withholding will be reduced by the amount of tax withheld. If withholding
results in an overpayment of taxes, a refund may be obtained.

6.  TRANSFER TAXES.

    The Company will pay all transfer taxes, if any, applicable to the transfer
of Initial Notes to it or its order pursuant to the Exchange Offer. If, however,
Exchange Notes and/or substitute Initial Notes not exchanged or accepted for
exchange are to be delivered to, or are to be registered or issued in the name
of, any person other than the registered holder of the Initial Notes tendered
hereby, or if tendered Initial Notes are registered in the name of any person
other than the person signing this Letter, or if a transfer tax is imposed for
any reason other than the transfer of Initial Notes to the Company or its order
pursuant to the Exchange Offer, the amount of any such transfer taxes (whether
imposed on the registered holder or any other persons) will be payable by the
tendering holder. If satisfactory evidence of payment of such taxes or exemption
therefrom is not submitted herewith, the amount of such transfer taxes will be
billed directly to such tendering holder.

    Except as provided in this Instruction 6, it will not be necessary for
transfer tax stamps to be affixed to the Initial Notes specified in this Letter.

                                       10
<PAGE>
7.  WAIVER OF CONDITIONS.

    Conditions enumerated in the Prospectus may be waived by the Company, in
whole or in part, at any time from time to time in its reasonable discretion.

8.  NO CONDITIONAL TENDERS.

    No alternative, conditional, irregular or contingent tenders will be
accepted. All tendering holders of Initial Notes, by execution of this Letter,
shall waive any right to receive notice of the acceptance of their Initial Notes
for exchange.

    Neither the Company nor any other person is obligated to give notice of
defects or irregularities in any tender, nor shall any of them incur any
liability for failure to give any such notice.

9.  INADEQUATE SPACE.

    If the space provided herein is inadequate, the aggregate principal amount
of Initial Notes being tendered and the certificate number or numbers (if
available) should be listed on a separate schedule attached hereto and
separately signed by all parties required to sign this Letter.

10. MUTILATED, LOST, STOLEN OR DESTROYED INITIAL NOTES.

    If any certificate has been lost, mutilated, destroyed or stolen, the holder
should promptly notify the IBJ Whitehall Bank & Trust Company at the telephone
number indicated above. The holder will then be instructed as to the steps that
must be taken to replace the certificate(s). This Letter of Transmittal and
related documents cannot be processed until the Initial Notes have been
replaced.

11. REQUESTS FOR ASSISTANCE OR ADDITIONAL COPIES.

    Questions relating to the procedure for tendering, as well as requests for
additional copies of the Prospectus and this Letter, may be directed to the IBJ
Whitehall Bank & Trust Company at the address and telephone number indicated
above.

                                       11
<PAGE>
                    TO BE COMPLETED BY ALL TENDERING HOLDERS
                              (SEE INSTRUCTION 5)

                        PAYER'S NAME: ANTEON CORPORATION

<TABLE>
<C>                          <S>                                      <C>
-------------------------------------------------------------------------------------------------------------
        SUBSTITUTE           PART I--Taxpayer Identification Number    ------------------------------------
         FORM W-9            Enter your taxpayer identification               Social Security Number
Department of the Treasury   number in the appropriate box. For most                    OR
 Internal Revenue Service    individuals, this is your social          ------------------------------------
                             security number. If you do not have a        Employer Identification Number
                             number, see how to obtain a "TIN" in
                             the enclosed Guidelines.
                             NOTE: If the account is in more than
                             one name, see the chart on page 2 of
                             the enclosed Guidelines to determine
                             what number to give.

                             --------------------------------------------------------------------------------

                             PART II--For Payees Exempt From Backup Withholding (see enclosed Guidelines)

                             --------------------------------------------------------------------------------

    Payer's Request for      CERTIFICATION--UNDER THE PENALTIES OF PERJURY, I CERTIFY THAT:
  Taxpayer Identification    (1) the number shown on this form is my correct Taxpayer Identification Number
     Number (TIN) and        (or I am waiting for a number to be issued to me), and
       Certification         (2) I am not subject to backup withholding either because I have not been
                             notified by the Internal Revenue Service (the "IRS") that I am subject to backup
                             withholding as a result of a failure to report all interest or dividends or the
                             IRS has notified me that I am no longer subject to backup withholding.
                             --------------------------------------------------------------------------------

                             Signature                                Date
                             ---------------------------------------  ---------------------------------------
-------------------------------------------------------------------------------------------------------------
 CERTIFICATION GUIDELINES--YOU MUST CROSS OUT ITEM (2) OF THE ABOVE CERTIFICATION IF YOU HAVE BEEN NOTIFIED
 BY THE IRS THAT YOU ARE SUBJECT TO BACKUP WITHHOLDING BECAUSE OF UNDER REPORTING OF INTEREST OR DIVIDENDS ON
 YOUR TAX RETURN. HOWEVER, IF AFTER BEING NOTIFIED BY THE IRS THAT YOU WERE SUBJECT TO BACKUP WITHHOLDING YOU
 RECEIVED ANOTHER NOTIFICATION FROM THE IRS THAT YOU ARE NO LONGER SUBJECT TO BACKUP WITHHOLDING, DO NOT
 CROSS OUT ITEM (2).
 --------------------------------------------------------------------------------------------
</TABLE>

         CERTIFICATION OF PAYEE AWAITING TAXPAYER IDENTIFICATION NUMBER

    I certify, under penalties of perjury, that a Taxpayer Identification Number
has not been issued to me, and that I mailed or delivered an application to
receive a Taxpayer Identification Number to the appropriate Internal Revenue
Service Center or Social Security Administration Office (or I intend to mail or
deliver an application in the near future). I understand that if I do not
provide a Taxpayer Identification Number to the payer, 31 percent of all
payments made to me on account of the Exchange Notes shall be retained until I
provide a Taxpayer Identification Number to the payer and that, if I do not
provide my Taxpayer Identification Number within sixty (60) days, such retained
amounts shall be remitted to the Internal Revenue Service as backup withholding
and 31 percent of all reportable payments made to me thereafter will be withheld
and remitted to the Internal Revenue Service until I provide a Taxpayer
Identification Number.

SIGNATURE ________________________________________________  DATE _______________

NOTE:  FAILURE TO COMPLETE AND RETURN THIS FORM MAY RESULT IN BACKUP WITHHOLDING
       OF 31% OF ANY PAYMENTS MADE TO YOU ON ACCOUNT OF THE EXCHANGE NOTES.
       PLEASE REVIEW THE ENCLOSED GUIDELINES FOR

                                       12
<PAGE>
       CERTIFICATION OF TAXPAYER IDENTIFICATION NUMBER ON SUBSTITUTE FORM W-9
       FOR ADDITIONAL DETAILS.

                                       13
