Document:

<PAGE>

                                                                   Exhibit 10.24

                        Supplement NO. 2 dated as of October 21, 2000, to the
                  Security Agreement dated as of June 23, 1999, among ANTEON
                  CORPORATION, a Virginia corporation (the "Borrower"), each
                  subsidiary of the Borrower listed on Schedule I thereto (each
                  such subsidiary individually a "Subsidiary Guarantor" and
                  collectively, the "Subsidiary Guarantors"; the Subsidiary
                  Guarantors and the Borrower are referred to collectively
                  herein as the "Grantors") and MELLON BANK, N.A., a national
                  banking association ("Mellon"), as collateral agent (in such
                  capacity, the "Collateral Agent") for the Secured Parties
                  (as defined herein).

      A. Reference is made to (a) the Credit Agreement dated as of June 23, 1999
(as amended, supplemented or otherwise modified from time to time, the "Credit
Agreement"), among the Borrower, the lenders from time to time party thereto
(the "Lenders"), Credit Suisse First Boston, a bank organized under the laws of
Switzerland, acting through its New York branch ("CSFB"), as administrative
agent for the Lenders (in such capacity, the "Administrative Agent") and as
issuing bank, Mellon, as Collateral Agent, syndication agent and swingline
leader, and Deutsche Bank AG, New York Branch, as documentation agent, and
(b) the Subsidiary Guarantee Agreement dated as of June 23, 1999 (as amended,
supplemented or otherwise modified from time to time, the "Guarantee
Agreement"), among the Subsidiary Guarantors and the Collateral Agent.

      B. Capitalized terms used herein and not otherwise defined herein shall
have the meanings assigned to such terms in the Security Agreement or the Credit
Agreement, as applicable.

      C. The Grantors have entered into the Security Agreement in order to
induce the Lenders to make Loans and the Issuing Bank to issue Letters of
Credit. Section 7.15 of Security Agreement provides that additional Subsidiaries
of the Borrower may become Grantors under the Security Agreement by execution
and delivery of an instrument in the form of this Supplement. The undersigned
Subsidiary (the "New Grantor") is executing this Supplement in accordance with
the requirements of the Credit Agreement to become a Grantor under the Security
Agreement in order to induce the Lenders to make additional Loans and the
Issuing Bank to issue additional Letters of Credit and as consideration for
Loans previously made and Letters of Credit previously issued.

      Accordingly, the Collateral Agent and the New Grantor agree as follows:

      SECTION 1. In accordance with Section 7.15 of the Security Agreement, the
New Grantor by its signature below becomes a Grantor under the Security
Agreement with the same force and effect as if originally named therein as a
Grantor and the New Grantor hereby (a) agrees to all the terms and provisions of
the Security Agreement applicable to it as a Grantor thereunder and (b)
represents and warrants that the representations and warranties made by it as a
Grantor thereunder are true and correct on and as of the date hereof. In
furtherance of the foregoing, the New Grantor, as security for the payment and
performance in full of the Obligations (as defined in the Security Agreement),
does hereby create and grant to the Collateral Agent, its successors and
assigns, for the benefit of the Secured Parties, their successors and assigns, a
security interest in and lien on all of the New Grantor's right, title and
interest in and to the Collateral (as defined in the Security Agreement) of the
New Grantor. Each reference to a "Grantor" in the Security Agreement shall be
deemed to include the New Grantor. The Security Agreement is hereby incorporated
herein by reference.

<PAGE>

      SECTION 2. The New Grantor represents and warrants to the Collateral Agent
and the other Secured Parties that this Supplement has been duly authorized,
executed and delivered by it and constitutes its legal, valid and binding
obligation, enforceable against it in accordance with its terms.

      SECTION 3. This Supplement may be executed in counterparts (and by
different parties hereto on different counterparts), each of which shall
constitute an original, but all of which when taken together shall constitute a
single contract. This Supplement shall become effective when the Collateral
Agent shall have received counterparts of this Supplement that, when taken
together, bear the signatures of the New Grantor and the Collateral Agent.
Delivery of an executed signature page to this Supplement by facsimile
transmission shall be as effective as delivery of a manually signed counterpart
of this Supplement.

      SECTION 4. The New Grantor hereby represents and warrants that (a) set
forth on Schedule 1 attached hereto is a true and correct schedule of the
location of any and all Collateral of the New Grantor and (b) set forth under
its signature hereto, is the true and correct location of the chief executive
office of the New Grantor.

      SECTION 5. Except as expressly supplemented hereby, the Security Agreement
shall remain in full force and effect.

      SECTION 6. THIS SUPPLEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

      SECTION 7. In case any one or more of the provisions contained in this
Supplement should be held invalid, illegal or unenforceable in any respect, the
validity, legality and enforceability of the remaining provisions contained
herein and in the Security Agreement shall not in any way be affected or
impaired thereby (it being understood that the invalidity of a particular
provision in a particular jurisdiction shall not in and of itself affect the
validity of such provision in any other jurisdiction). The parties hereto shall
endeavor in good-faith negotiations to replace the invalid, illegal or
unenforceable provisions with valid provisions the economic effect of which
comes as close as possible to that of the invalid, illegal or unenforceable
provisions.

      SECTION 8. All communications and notices hereunder shall be in writing
and given as provided in Section 7.01 of the Security Agreement. All
communications and notices hereunder to the New Grantor shall be given to it at
the address set forth under its signature below.

      SECTION 9. The New Grantor agrees to reimburse the Collateral Agent for
its reasonable out-of-pocket expenses in connection with this Supplement,
including the reasonable fees, other charges and disbursements of counsel for
the Collateral Agent.

<PAGE>

      IN WITNESS WHEREOF, the New Grantor and the Collateral Agent have duly
executed this Supplement to the Security Agreement as of the day and year first
above written.

                                      SHERIKON, INC., as a New Grantor,

                                      by: /s/ Carlton B. Crenshaw
                                         ---------------------------------------
                                         Name: Carlton B. Crenshaw
                                         Title: Vice President
                                         Address: 14500 Avion Pkwy, Suite 200,
                                         Chantilly, VA 20151

                                      SOUTH TEXAS SHIP REPAIR, INC., as a New
                                      Grantor,

                                      by: /s/ Carlton B. Crenshaw
                                         ---------------------------------------
                                         Name: Carlton B. Crenshaw
                                         Title: Vice President
                                         Address: Redfish Bay Terminal, Ocean
                                         Drive at Beasley, Aransas Pass, TX
                                         78336

                                      SHERIKON SPACE SYSTEMS, INC., as a
                                      New Grantor,

                                      by: /s/ Carlton B. Crenshaw
                                         ---------------------------------------
                                         Name: Carlton B. Crenshaw
                                         Title: Vice President
                                         Address: 12249 Science Drive, Suite
                                         106, Orlando, FL 32826

                                      MELLON BANK, N.A., as Collateral Agent,

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

<PAGE>

                                                                               3

      IN WITNESS WHEREOF, the New Grantor and the Collateral Agent have duly
executed this Supplement to the Security Agreement as of the day and year first
above written.

                                      SHERIKON, INC., as a New Grantor,

                                      by:
                                         ---------------------------------------
                                         Name:
                                         Title:
                                         Address: 14500 Avion Pkwy, Suite 200,
                                         Chantilly, VA 20151

                                      SOUTH TEXAS SHIP REPAIR, INC., as a New
                                      Grantor,

                                      by:
                                         ---------------------------------------
                                         Name:
                                         Title:
                                         Address: Redfish Bay Terminal, Ocean
                                         Drive at Beasley, Aransas Pass, TX
                                         78336

                                      SHERIKON SPACE SYSTEMS, INC., as a
                                      New Grantor,

                                      by:
                                         ---------------------------------------
                                         Name:
                                         Title:
                                         Address: 12249 Science Drive, Suite
                                         106, Orlando, FL 32826

                                      MELLON BANK, N.A., as Collateral Agent

                                      by: /s/ Leslie A. Grizzard
                                         ---------------------------------------
                                         Name: Leslie A. Grizzard
                                         Title: Vice President

<PAGE>

                                                                   Schedule 1 to
                                                             Supplement No. 2 to
                                                          the Security Agreement

                             LOCATION OF COLLATERAL

      1. Names.

      (a) The exact corporate name of each Grantor, as such name appears in its
respective certificate of incorporation, is as follows:

            Sherikon, Inc.
            South Texas Ship Repair, Inc.
            Sherikon Space Systems, Inc.

      (b) Set forth below is each other corporate name each Grantor has had in
the past five years, together with the date of the relevant change:

            None.

      (c) No Grantor has changed its identity or corporate structure in any way
within the past five years. Changes in identity or corporate structure would
include mergers, consolidations and acquisitions, as well as any change in the
form, nature or jurisdiction of corporate organization. If any such change has
occurred, include below the information required in this Schedule 1 as to each
acquiree or constituent party to a merger or consolidation.

      (d) The following is a list of all other names (including trade names or
similar appellations) used by each Grantor or any of its divisions or other
business units in connection with the conduct of its business or the ownership
of its properties at any time during the past five years:

            None.

      (e) Set forth below is the Federal Taxpayer Identification Number of each
Grantor:

          Sherikon, Inc.                   --72-1019239
          South Texas Ship Repair, Inc.    --74-2781148
          Sherikon Space Systems, Inc.     --54-1684887

<PAGE>

                                                                               2

                                                                   SCHEDULE 1 to
                                                             Supplement No. 2 to
                                                          the Security Agreement

      2. Current Locations.

      (a) The chief executive office of each Grantor is located at the address
set forth opposite its name below:

<TABLE>
<CAPTION>

Grantor                       Mailing Address           County       State
-------                       ---------------           ------       -----

<S>                           <C>                       <C>           <C>
Sherikon, Inc                 14500 Avion Parkway       Fairfax        VA
                              Ste. 200, Chantilly,
                              Va 20151

South Texas Ship Repair, Inc. Redfish Bay Terminal      San Patricio   TX
                              Ocean Drive at Beasley
                              Aransas Pass, TX 78336

Sherikon Space Systems, Inc   12249 Science Drive,      Orange         FL
                              Suite 106
                              Orlando, Fl 32826
</TABLE>

      (b) Set forth below opposite the name of each Grantor are all locations
where such Grantor maintains any books or records relating to any Accounts
Receivable and all other places of business of New Grantor:

<TABLE>
<CAPTION>

Grantor                       Mailing Address           County       State
-------                       ---------------           ------       -----

<S>                           <C>                       <C>           <C>
Sherikon, Inc                 14500 Avion Parkway       Fairfax       VA
                              Ste. 200, Chantilly,
                              Va 20151

South Texas Ship Repair, Inc  Redfish Bay Terminal      San Patricio  TX
                              Ocean Drive at Beasley
                              Aransas Pass, TX 78336

Sherikon, Inc. and            12249 Science Drive,      Orange        FL
Sherikon Space Systems, Inc   Suite 106
                              Orlando, Fl 32826

Sherikon, Inc.                2711 Jefferson Davis      Arlington     VA
                              Highway, Suite 500,
                              Arlington, VA 22202

Sherikon, Inc.                2805 South Crystal        Arlington     VA
                              Drive Arlington, VA 22202

Sherikon, Inc.                92 Thomas Johnson         Washington    MD
                              Drive, Suite 130
                              Frederick, MD 21702
</TABLE>

<PAGE>

                                                                               3

                                                                   SCHEDULE 1 to
                                                             Supplement No. 2 to
                                                          the Security Agreement

<TABLE>
<CAPTION>

Grantor           Mailing Address                  County          State
-------           ---------------                  ------          -----

<S>               <C>                             <C>               <C>
Sherikon, Inc.    355 N. 21st Street, Ste. 204    Cumberland        PA
                  Camp Hill, PA 17011-3707

Sherikon, Inc.    4332 Cerritos Ave., Ste. 106    Orange            CA
                  Los Alamitos, CA 90720

Sherikon, Inc.    8610 North New Braunfels,       Bexar             TX
                  Suite 100
                  San Antonio, TX 78217

Sherikon, Inc.    9449 Balboa Avenue              San Diego         CA
                  Suite 111
                  San Diego, CA 92123

Sherikon, Inc.    8601 Georgia Avenue             Montgomery        MD
                  Suite 900
                  Silver Spring, MA 20910

Sherikon, Inc.    5205 Leesburg Pike              Fairfax           VA
                  Suite 310
                  Falls Church, VA 22041

Sherikon Space    145 North Altadena Drive        Los Angeles       CA
Systems, Inc.     Pasadena, CA 91107
</TABLE><PAGE>

                                                                   Exhibit 10.25

                                                                  EXECUTION COPY

                        AMENDMENT No. 5 and WAIVER dated as of December 31, 2000
                  (this "Amendment"), to the Credit Agreement dated as of June
                  23, 1999, as amended by Amendment No. 1 dated as of January
                  13, 2000, Amendment No. 2 dated as of March 29, 2000,
                  Amendment No. 3 dated as of June 30, 2000, and Amendment No. 4
                  and Waiver dated as of October 19, 2000 (the "Credit
                  Agreement"), among ANTEON INTERNATIONAL CORPORATION, a
                  Virginia corporation (the "Borrower"), the Lenders (as defined
                  in Article I of the Credit Agreement), CREDIT SUISSE FIRST
                  BOSTON, a bank organized under the laws of Switzerland, acting
                  through its New York branch, as an Issuing Bank (as defined in
                  Article I of the Credit Agreement), and as administrative
                  agent (in such capacity, the "Administrative Agent") for the
                  Lenders, MELLON BANK, N.A., a national banking association, as
                  syndication agent (in such capacity, the "Syndication Agent"),
                  as swingline lender (in such capacity, the "Swingline
                  Lender"), and as collateral agent (in such capacity, the
                  "Collateral Agent") for the Lenders, and DEUTSCHE BANK AG, New
                  York Branch, as documentation agent (in such capacity, the
                  "Documentation Agent").

      A. Pursuant to the Credit Agreement, the Lenders and the Issuing Banks
have extended, and have agreed to extend, credit to the Borrower.

      B. The Borrower has requested a limited waiver and amendment of the Credit
Agreement as set forth herein. The Required Lenders are willing to grant such
waiver and to amend the Credit Agreement on the terms and subject to the
conditions set forth herein.

      C. Capitalized terms used but not defined herein shall have the meanings
assigned to them in the Credit Agreement.

      Accordingly, in consideration of the mutual agreements herein contained
and other good and valuable consideration, the sufficiency and receipt of which
are hereby acknowledged, the parties hereto agree as follows:

      SECTION 1. Waiver. The Required Lenders hereby waive compliance by the
Borrower with the provisions of Section 6.08(b) of the Credit Agreement for the
fiscal year ending December 31, 2000, so long as the actual aggregate amount of
Capital Expenditures during such fiscal year does not exceed $6,700,000.

      SECTION 2. Amendments. (a) Section 6.01(j) of the Credit Agreement is
hereby amended by deleting the reference to "$500,000" and replacing it with the
reference to "$1,000,000".

            (b) Section 6.09 of the Credit Agreement is hereby amended by
replacing the table set forth therein with the following:

      Date or Period                                     Ratio
      --------------                                     -----

      December 31, 2000 through September 30, 2001       1.75:1.0

<PAGE>
                                                                               2

      October 1,2001 through December 31, 2001           2.00:1.0
      March 31, 2002 through December 31, 2002           2.25:1.0
      March 31, 2003 through December 31, 2003           2.50:1.0
      March 31, 2004 and thereafter                      3.00:1.0

      SECTION 3. Representations and Warranties. To induce the other parties
hereto to enter into this Amendment, the Borrower represents and warrants to
each of the Lenders, the Administrative Agent, the Issuing Banks, the Collateral
Agent, the Syndication Agent and the Documentation Agent that, after giving
effect to this Amendment, (a) the representations and warranties set forth in
Article III of the Credit Agreement are true and correct in all material
respects on and as of the date hereof, except to the extent such representations
and warranties expressly relate to an earlier date, and (b) no Default or Event
of Default has occurred and is continuing.

      SECTION 4. Amendment Fee. The Borrower agrees to pay to each Lender that
executes and delivers a copy of this Amendment to the Administrative Agent (or
its counsel) at or prior to 12:00 noon on March 30, 2001, an amendment fee (the
"Amendment Fee") in an amount equal to 0.25% of the sum of such Lender's
Revolving Credit Commitment (whether used or unused) and outstanding Term Loans,
in each case as of the Amendment Effective Date (as defined below). The
Amendment Fee shall be payable in immediately available funds on the Amendment
Effective Date. Once paid, the Amendment Fee shall not be refundable.

      SECTION 5. Effectiveness. This Amendment shall become effective as of the
date set forth above on the date (the "Amendment Effective Date") that the
following conditions are satisfied:

            (a) the Administrative Agent shall have received the Amendment Fee;
      and

            (b) the Administrative Agent shall have received counterparts of
      this Amendment that, when taken together, bear the signatures of the
      Borrower, the Guarantors and the Required Lenders.

      SECTION 6. Effect of Amendment. Except as expressly set forth herein, this
Amendment shall not by implication or otherwise limit, impair, constitute a
waiver of or otherwise affect the rights and remedies of the Lenders, the
Issuing Banks, the Collateral Agent, the Administrative Agent, the Syndication
Agent or the Documentation Agent under the Credit Agreement or any other Loan
Document, and shall not alter, modify, amend or in any way affect any of the
terms, conditions, obligations, covenants or agreements contained in the Credit
Agreement or any other Loan Document, all of which are ratified and affirmed in
all respects and shall continue in full force and effect. Nothing herein shall
be deemed to entitle any Loan Party to a consent to, or a waiver, amendment,
modification or other change of, any of the terms, conditions, obligations,
covenants or agreements contained in the Credit Agreement or any other Loan
Document in similar or different circumstances. This Amendment shall apply and
be effective only with respect to the provisions of the Credit Agreement
specifically referred to herein. After the date hereof, any reference to the
Credit Agreement shall mean the Credit Agreement, as modified hereby. This
Amendment shall constitute a "Loan Document" for all purposes of the Credit
Agreement and the other Loan Documents.

      SECTION 7. Counterparts. This Amendment may be executed in any number of
counterparts and by different parties hereto in separate counterparts, each of
which when

<PAGE>
                                                                               3

so executed and delivered shall be deemed an original, but all such counterparts
together shall constitute but one and the same contract. Delivery of an executed
counterpart of a signature page of this Amendment by facsimile transmission
shall be as effective as delivery of a manually executed counterpart hereof.

      SECTION 8. Applicable Law. THIS AMENDMENT SHALL BE GOVERNED BY, AND
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

      SECTION 9. Headings. The headings of this Amendment are for purposes of
reference only and shall not limit or otherwise affect the meaning hereof.

      SECTION 10. Expenses. The Borrower agrees to reimburse the Administrative
Agent for all out-of-pocket expenses in connection with this Amendment,
including the reasonable fees, charges and disbursements of Cravath, Swaine &
Moore, counsel for the Administrative Agent.

       SECTION 11. Acknowledgment of Guarantors. Each of the Guarantors hereby
acknowledges receipt and notice of, and consents to the terms of, this
Amendment.

<PAGE>
                                                                               4

            IN WITNESS WHEREOF, the parties hereto have caused this Amendment to
be duly executed by their duly authorized officers, all as of the date and year
first above written.

                                   ANTEON INTERNATIONAL CORPORATION,

                                   by:
                                       /s/ Carlton B. Crenshaw
                                      ------------------------------------------
                                      Name:  CARLTON B. CRENSHAW
                                      Title: SR. V.P. FINANCE AND ADMIN.

                                   ANTEON CORPORATION,

                                   by:
                                       /s/ Carlton B. Crenshaw
                                      ------------------------------------------
                                      Name:  CARLTON B. CRENSHAW
                                      Title: SR. V.P. FINANCE AND ADMIN.

                                   INTERACTIVE MEDIA CORP.,

                                   by:
                                       /s/ Carlton B. Crenshaw
                                      ------------------------------------------
                                      Name:  CARLTON B. CRENSHAW
                                      Title: VICE PRESIDENT

                                   CREDIT SUISSE FIRST BOSTON, individually
                                   and as Administrative Agent and Issuing Bank,

                                   by:

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

                                   by:

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

                                   MELLON BANK, NA., individually and as
                                   Collateral Agent, Swingline Lender and
                                   Syndication Agent,

                                   by:

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

<PAGE>
                                                                               4

            IN WITNESS WHEREOF, the parties hereto have caused this Amendment to
be duly executed by their duly authorized officers, all as of the date and year
first above written.

                                   ANTEON INTERNATIONAL CORPORATION,

                                   by:

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

                                   ANTEON CORPORATION,

                                   by:

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

                                   INTERACTIVE MEDIA CORP.,

                                   by:

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

                                   CREDIT SUISSE FIRST BOSTON, individually
                                   and as Administrative Agent and Issuing Bank,

                                   by:
                                      /s/ Robert Hetu
                                      ------------------------------------------
                                      Name:  ROBERT HETU
                                      Title: DIRECTOR

                                   by:
                                      /s/ Lalita Advani
                                      ------------------------------------------
                                      Name:  LALITA ADVANI
                                      Title: ASSISTANT VICE PRESIDENT

                                   MELLON BANK, NA., individually and as
                                   Collateral Agent, Swingline Lender and
                                   Syndication Agent,

                                   by:

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

<PAGE>
                                                                               4

            IN WITNESS WHEREOF, the parties hereto have caused this Amendment to
be duly executed by their duly authorized officers, all as of the date and year
first above written.

                                   ANTEON INTERNATIONAL CORPORATION,

                                   by:

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

                                   ANTEON CORPORATION,

                                   by:

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

                                   INTERACTIVE MEDIA CORP.,

                                   by:

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

                                   CREDIT SUISSE FIRST BOSTON, individually
                                   and as Administrative Agent and Issuing Bank,

                                   by:

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

                                   by:

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

                                   MELLON BANK, NA., individually and as
                                   Collateral Agent, Swingline Lender and
                                   Syndication Agent,

                                   by:
                                       /s/ David H. Reed
                                      ------------------------------------------
                                      Name:  DAVID H. REED
                                      Title: 1st VICE PRESIDENT

<PAGE>

                              Signature Page for Amendment No. 5 and Waiver
                              dated as of December 31, 2000 to the Anteon Credit
                              Agreement

                              SHERIKON, INC.

                              by:
                                   /s/ Carlton B. Crenshaw
                                  ----------------------------------------------
                                  Name:  Carlton B. Crenshaw
                                  Title: Senior Vice President, Finance and
                                         Administration

                              SOUTH TEXAS REPAIR, INC.

                              by:
                                   /s/ Carlton B. Crenshaw
                                  ----------------------------------------------
                                  Name:  Carlton B. Crenshaw
                                  Title: Senior Vice President, Finance and
                                         Administration

                              SHERIKON SPACE SYSTEMS, INC.

                              by:
                                   /s/ Carlton B. Crenshaw
                                  ----------------------------------------------
                                  Name:  Carlton B. Crenshaw
                                  Title: Senior Vice President, Finance and
                                         Administration

                              ANTEON - CITI, LLC

                              by:
                                   /s/ Curtis L. Schehr
                                  ----------------------------------------------
                                  Name:  Curtis L. Schehr
                                  Title: Vice President

<PAGE>

                              Signature Page for Amendment No. 5 and Waiver
                              dated as of December 31, 2000 to the Anteon Credit
                              Agreement

To Approve the Amendment:

Name of Institution:          Mellon Bank
                              --------------------------------------------------

                              by:
                                   /s/ David H. Reed
                                  ----------------------------------------------
                                  Name: David H. Reed
                                  Title: 1st Vice President

<PAGE>

                              Signature Page for Amendment No. 5 and Waiver
                              dated as of December 31, 2000 to the Anteon Credit
                              Agreement

To Approve the Amendment:

                              Transamerica Business Capital Corporation
                              (successor to Transamerica Business
                              Credit Corporation)

                              by: /s/ Stephen K. Goetschius
                                  ----------------------------------------------

                              Name: Stephen K. Goetschius
                              Title: Senior Vice President

<PAGE>

                              Signature Page for Amendment No. 5 and Waiver
                              dated as of December 31, 2000 to the Anteon Credit
                              Agreement

                              IBM Credit Corporation

                              by:
                                   /s/ Thomas S. Curcio
                                  ----------------------------------------------
                              Name:  Thomas S. Curcio
                              Title: Manager of Credit, Commercial and
                                      Specialty Financing

<PAGE>

                              Signature Page for Amendment No. 5 and Waiver
                              dated as of December 31, 2000 to the Anteon Credit
                              Agreement

To Approve the Amendment:

Name of Institution:          FLEET NATIONAL BANK
                              --------------------------------------------------

                              by:
                                   /s/ Roger C. Boucher
                                  ----------------------------------------------
                                  Name: Roger C. Boucher
                                  Title: Director

<PAGE>

                              Signature Page for Amendment No. 5 and Waiver
                              dated as of December 31, 2000 to the Anteon Credit
                              Agreement

To Approve the Amendment:

Name of Institution:
                              Deutsche Bank AG, New York Branch and/or
                              Cayman Islands Branch

                              by:
                                   /s/ David G. Dickinson, Jr.
                                  ----------------------------------------------
                                  Name: David G. Dickinson, Jr.
                                  Title: Vice President

                              by:
                                  /s/ Christopher A. Koch
                                  ----------------------------------------------
                                  Name: Christopher A. Koch
                                  Title: Vice President

<PAGE>

                              Signature Page for Amendment No. 5 and Waiver
                              dated as of December 31, 2000 to the Anteon Credit
                              Agreement

To Approve the Amendment:

Name of Institution:          Branch Banking & Trust Company
                              --------------------------------------------------

                              by:
                                  /s/ Ronald P. Gudbrandsen
                                  ----------------------------------------------
                                  Name: Ronald P. Gudbrandsen
                                  Title: Vice President
<PAGE>

                              Signature Page for Amendment No. 5 and Waiver
                              dated as of December 31, 2000 to the Anteon Credit
                              Agreement

To Approve the Amendment:

Name of Institution:          Bank Polska Kasa Opieki S.A.
                              --------------------------------------------------

                              by:
                                   /s/ Hussein B. El-Tawil
                                  ----------------------------------------------
                                  Name: Hussein B. El-Tawil
                                  Title: Vice President

<PAGE>

                              Signature Page for Amendment No. 5 and Waiver
                              dated as of December 31, 2000 to the Anteon Credit
                              Agreement

To Approve the Amendment:

Name of Institution:          The Bank of Nova Scotia
                              --------------------------------------------------

                              by:
                                   /s/ Todd S. Meller
                                  ----------------------------------------------
                                  Name:  TODD S. MELLER
                                  Title: MANAGING DIRECTOR
<PAGE>

                              Signature Page for Amendment No. 5 and Waiver
                              dated as of December 31, 2000 to the Anteon Credit
                              Agreement

To Approve the Amendment:

Name of Institution:          PNC BUSINESS CREDIT
                              --------------------------------------------------

                              by:
                                   /s/ Eric Huff
                                  ----------------------------------------------
                                  Name:  ERIC HUFF
                                  Title: ASSISTANT VICE PRESIDENT

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