
<PAGE>
                         NOTICE OF GUARANTEED DELIVERY
                                      FOR
                             TENDER OF OUTSTANDING
                     12% SENIOR SUBORDINATED NOTES DUE 2009
                                IN EXCHANGE FOR
                     12% SENIOR SUBORDINATED NOTES DUE 2009
            REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED,
                                       OF
                               ANTEON CORPORATION

    Registered holders of outstanding 12% Senior Subordinated Notes due 2009
(the "Initial Notes") who wish to tender their Initial Notes in exchange for a
like principal amount of 12% Senior Subordinated Notes due 2009 (the "Exchange
Notes") and whose Initial Notes are not immediately available or who cannot
deliver their Initial Notes and Letter of Transmittal (and any other documents
required by the Letter of Transmittal) to IBJ Whitehall Bank & Trust Company
(the "Exchange Agent") prior to the Expiration Date, may use this Notice of
Guaranteed Delivery or one substantially equivalent hereto. This Notice of
Guaranteed Delivery may be delivered by hand or sent by facsimile transmission
(receipt confirmed by telephone and an original delivered by guaranteed
overnight courier) or letter to the Exchange Agent. See "The Exchange
Offer--Procedures for Tendering Initial Notes" in the Prospectus.

                 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 Notice of Guaranteed Delivery to an address other than as
set forth above or transmission of instructions via a facsimile transmission to
a number other than as set forth above will not constitute a valid delivery.

    This Notice of Guaranteed Delivery is not to be used to guarantee
signatures. If a signature on a Letter of Transmittal is required to be
guaranteed by an Eligible Institution (as defined in the Prospectus), such
signature guarantee must appear in the applicable space provided on the Letter
of Transmittal for Guarantee of Signatures.
<PAGE>
Ladies and Gentlemen:

    The undersigned hereby tenders the principal amount of Initial Notes
indicated below, upon the terms and subject to the conditions contained in the
Prospectus dated       , 1999 of Anteon Corporation, receipt of which is hereby
acknowledged.

                       DESCRIPTION OF SECURITIES TENDERED

<TABLE>
<CAPTION>
            NAME AND ADDRESS OF
          REGISTERED HOLDER AS IT
            APPEARS ON THE 12%
            SENIOR SUBORDINATED              CERTIFICATE NUMBER(S)    AGGREGATE PRINCIPAL   PRINCIPAL AMOUNT OF
         NOTES DUE 2009 ("INITIAL                      OF            AMOUNT REPRESENTED BY     INITIAL NOTES
          NOTES") (PLEASE PRINT)             INITIAL NOTES TENDERED      INITIAL NOTES            TENDERED

<S>                                          <C>                     <C>                    <C>
----------------------------------           -----------------       ----------------       ---------------

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

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

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

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

                                       2
<PAGE>
                   THE FOLLOWING GUARANTEE MUST BE COMPLETED

                             GUARANTEE OF DELIVERY

                    (NOT TO BE USED FOR SIGNATURE GUARANTEE)

    The undersigned, a firm that is a member of a registered national securities
exchange or a member of the National Association of Securities Dealers, Inc. or
a commercial bank or trust company having an office, branch, agency or
correspondent in the United States, hereby guarantees to deliver to the Exchange
Agent at one of its addresses set forth above, the certificates representing the
Initial Notes, together with a properly completed and duly executed Letter of
Transmittal (or facsimile thereof), with any required signature guarantees, and
any other documents required by the Letter of Transmittal within three New York
Stock Exchange, Inc. trading days after the date of execution of this Notice of
Guaranteed Delivery.

NAME OF FIRM: __________________________________________________________________

                             (AUTHORIZED SIGNATURE)

ADDRESS: ________________________________TITLE: ________________________________
______________________________________________ NAME: ___________________________

                                 (ZIP
CODE)                                             (PLEASE TYPE OR PRINT)

AREA CODE AND TELEPHONE NUMBER: _____________________ DATE: ____________________

NOTE: DO NOT SEND INITIAL NOTES WITH THIS NOTICE OF GUARANTEED DELIVERY. INITIAL
NOTES SHOULD BE SENT WITH YOUR LETTER OF TRANSMITTAL.

                                       3
