Document:

<PAGE>

                                                                   Exhibit 10.16

                     AGREEMENT dated as of October 14, 1999, among CRIMINAL
                  INVESTIGATIVE TECHNOLOGY, INC., a Delaware corporation (the
                  "MINORITY HOLDER"), ANTEON CORPORATION, a Virginia corporation
                  (the "BORROWER") 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 in
                  the Credit Agreement referred to below).

     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, as administrative agent
for the Lenders, and as issuing bank, Mellon, as Collateral Agent, swingline
lender and syndication agent, and Deutsche Bank AG, New York Branch, as
documentation agent, (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 Subsidiaries of the Borrower party
thereto (the "GUARANTORS") and the Collateral Agent, and (c) the Security
Agreement dated as of June 23, 1999 (as amended, supplemented or otherwise
modified from time to time, the "SECURITY AGREEMENT"), among the Borrower,
certain of the Guarantors (together with the Borrower, the "GRANTORS") and
the Collateral Agent. Capitalized terms used herein and not defined herein
shall have the meanings assigned to such terms in the Credit Agreement.

     The Lenders have made, and have agreed to make, Loans to the Borrower,
and the Issuing Bank has issued, and has agreed to issue, Letters of Credit
for the account of the Borrower, pursuant to, and upon the terms and subject
to the conditions specified in, the Credit Agreement. The Guarantors have
guaranteed such Loans and the other Obligations (as defined in the Guarantee
Agreement) of the Borrower under the Credit Agreement pursuant to the
Guarantee Agreement and the Grantors have granted Liens on and security
interests in certain of their assets to secure such guarantees pursuant to
the Security Agreement and the other Security Documents.

     The Borrower has agreed to acquire (the "ACQUISITION"), directly or
indirectly, not less than 80% of the issued and outstanding Equity Interests
of Anteon-CITI LLC, a Delaware limited liability company (the "COMPANY").
Immediately following the Acquisition, the Minority Holder will own Equity
Interests (the "MINORITY EQUITY INTERESTS") representing 2% of the issued and
outstanding Equity Interests of the Company. Pursuant to the Credit
Agreement, the Borrower may not consummate the Acquisition unless, among other
things,

<PAGE>
                                                                 2

the Minority Holder executes and delivers to the Collateral Agent an
agreement in the form hereof.

     Accordingly, the Minority Holder agrees, for the benefit of the
Collateral Agent, the Secured Parties and the Borrower, as follows:

     SECTION 1. ACKNOWLEDGMENT. The Minority Holder acknowledges that the
Company and some or all of its direct and indirect subsidiaries may become a
party to, and be bound to perform under, the Guarantee Agreement as
Guarantors, the Security Agreement as Grantors and any other Security
Document required to be executed and delivered by the Company and such
subsidiaries pursuant to the foregoing or pursuant to the provisions of
Section 5.12 of the Credit Agreement.

     SECTION 2. CONSENT AND AGREEMENT. The Minority Holder consents to the
foregoing and agrees that it will not take any action that would have the
effect of restraining or interfering with the assertion by the Collateral
Agent or any other Secured Party of any claims, or the exercise by the
Collateral Agent or any other Secured Party of any rights that any of them
may at any time have, against the Company, any of its direct or indirect
subsidiaries or any of their respective assets, pursuant to or in connection
with the Guarantee Agreement, any Security Document or any other Loan
Document.

     SECTION 3. TRANSFER, ETC. The Minority Holder further agrees that it
will not sell, transfer, pledge or encumber the Minority Equity Interest
owned by it except (a) as permitted by the Company's limited liability
company agreement and (b) to a person that shall have delivered to the
Collateral Agent an agreement substantially in the form hereof with respect
to such Minority Equity Interest.

     SECTION 4. WAIVER. The Minority Holder acknowledges that the Company
will receive substantial benefit from the credit facilities provided under
the Credit Agreement and, to the extent it may lawfully do so, waives any and
all claims, at law or in equity, that it may have against the Borrower, the
Company, their respective Affiliates and their respective officers, directors
and controlling persons arising from or as a result of the transactions
contemplated by the Loan Documents to which the Company and its subsidiaries
may become a party.

     SECTION 5. GOVERNING LAW. THIS AGREEMENT SHALL BE GOVERNED BY, AND
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

     SECTION 6. NO WAIVER; AMENDMENT. (a) No failure on the part of the
Collateral Agent or the Borrower to exercise, and no delay in exercising,
any right, power or remedy hereunder shall operate as a waiver thereof, nor
shall any single or partial exercise of any such right, power or remedy by
the Collateral Agent or the Borrower preclude any other or further exercise
thereof or the exercise of any other right, power or remedy. All remedies
hereunder are

<PAGE>
                                                                 3

cumulative and are not exclusive of any other remedies provided
by law. Neither of the Collateral Agent nor the Borrower shall be deemed to
have waived any rights hereunder unless such waiver shall be in writing and
signed by such parties.

     (b) Neither this Agreement nor any provision hereof may be waived,
amended or modified except pursuant to a written agreement entered into
between the Minority Holder, the Borrower and the Collateral Agent, with the
prior written consent of the Required Lenders.

     SECTION 7. NOTICES. All communications and notices hereunder shall
be in writing and shall be delivered by hand or overnight courier service,
mailed by certified or registered mail or sent by fax, as follows:

          (a) if to the Borrower, to it at 3211 Jermantown Road, Suite 700,
     Fairfax, Virginia 22030-2801, Attention of Curtis L. Schehr, Esq. (Fax
     No. (703) 246-0557), with a copy to Paul, Weiss, Rifkind, Wharton &
     Garrison, 1285 Avenue of the Americas, New York, New York 10019-6064,
     Attention of Carl L. Reisner, Esq. (Fax No. (212) 757-3990);

          (b) if to the Collateral Agent, to Mellon Bank, N.A., 1901 Research
     Blvd., Room 201-0320, 6th Floor, Rockville, MD 20850, Attention of
     Leslie Grizzard (Fax No. (301) 309-3458), with a copy to Credit Suisse
     First Boston, at Eleven Madison Avenue, New York, New York 10010,
     Attention of Matthew Carter (Fax No. (212) 325-8304); and

          (c) if to the Minority Holder, to Robert Fratarcangelo, Criminal
     Investigative Technology, Inc., 10852 Oakcrest Court, Fairfax, VA 22030
     (Fax No. (703) 352-0937.

All notices and other communications given to any party hereto in accordance
with the provisions of this Agreement shall be deemed to have been given on the
date of receipt if delivered by hand or overnight courier service or sent by fax
or on the date five Business Days after dispatch by certified or registered mail
if mailed, in each case delivered, sent or mailed (properly addressed) to such
party as provided in this Section 7 or in accordance with the latest unrevoked
direction from such party given in accordance with this Section 7. Any party may
change its address for Notices by giving notice of such change to each party in
accordance with this Section 7.

     SECTION 8. BINDING AGREEMENT; ASSIGNMENTS. Whenever in this Agreement
any of the parties hereto is referred to, such reference shall be deemed to
include the successors and assigns of such party; and all covenants, promises
and agreements by or on behalf of the parties that are contained in this
Agreement shall bind and inure to the benefit of their respective successors
and assigns.

<PAGE>
                                                                 4

     SECTION 9. SURVIVAL OF AGREEMENT; SEVERABILITY. (a) All covenants and
agreements made by the Minority Holder shall be considered to have been
relied upon by the Collateral Agent, the other Secured Parties and the
Borrower and shall survive the making by the Lenders of the Loans and the
issuance of the Letters of Credit by the Issuing Bank, and shall continue in
full force and effect.

     (b) In case any one or more of the provisions contained in this
Agreement should be held invalid, illegal or unenforceable in any respect, no
party hereto shall be required to comply with such provision for so long as
such provision is held to be invalid, illegal or unenforceable, but the
validity, legality and enforceability of the remaining provisions contained
herein shall not in any way be affected or impaired thereby. The parties
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 10. COUNTERPARTS. This Agreement 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. Delivery of an executed signature page to this
Agreement by fax trammission shall be as effective as delivery of a manually
signed counterpart of this Agreement.

     SECTION 11. RULES OF INTERPRETATION. The rules of interpretation
specified in Section 1.02 of the Credit Agreement shall be applicable to this
Agreement.

<PAGE>
                                                                 5

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their duly authorized officers as of the date first appearing
above.

                                       CRIMINAL INVESTIGATE TECHNOLOGY, INC.

                                       by:  /s/ Robert Fratarcangelo
                                          -------------------------------
                                           Name: Robert Fratarcangelo
                                           Title: President

                                       ANTEON CORPORATION

                                       by: /s/ Carlton B. Crenshaw
                                          -------------------------------
                                          Name: Carlton B. Crenshaw
                                          Title: SR. V.P. Finance and Admin.

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

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

                                                                   Exhibit 10.17

                                                                  EXECUTION COPY

                        AMENDMENT NO. 1 dated as of January 13, 2000 (this
                  "Amendment"), to the CREDIT AGREEMENT dated as of June 23,
                  1999, (the "Credit Agreement"), among ANTEON CORPORATION, a
                  Virginia corporation (the "Borrower"), the Lenders (as defined
                  in Article 1 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 Bank have
extended, and have agreed to extend, credit to the Borrower.

      B. The Borrower has requested that the Required Lenders agree to amend the
Credit Agreement as provided herein to allow the Borrower, among other things,
to sell and finance Third Party Government Receivables (as defined below).

      C. The Required Lenders are willing so to amend the Credit Agreement
pursuant to the terms and subject to the conditions set forth herein.

      D. 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. Amendments to Section 1.01. (a) The following definitions are
hereby inserted into Section 1.01 of the Credit Agreement in the appropriate
alphabetical order:

            ""Third Party Financing" shall mean the purchase on a nonrecourse
      basis from the Borrower or any Subsidiary of Third Party Government
      Receivables by a person that is not an Affiliate of the Borrower."

<PAGE>

            ""Third Party Government Receivables" shall mean all Accounts of the
      Borrower or any Subsidiary with respect to which the Account Debtor is the
      Government, which arise pursuant to a Third Party Sale and which are sold
      pursuant to a Third Party Financing."

            ""Third Party Sale" shall mean the sale to the Government by the
      Borrower or any Subsidiary of products and/or services acquired from or to
      be provided by, respectively, a person that is not the Borrower or an
      Affiliate of the Borrower, so long as the Account arising therefrom is
      promptly sold pursuant to a Third Party Financing."

      (b) The definition of "Asset Sale" in Section 1.01 of the Credit Agreement
is hereby amended and restated to read as follows:

            ""Asset Sale" shall mean the sale, transfer or other disposition (by
      way of merger, casualty, condemnation or otherwise) by the Borrower or any
      of the Subsidiaries to any person other than the Borrower or any
      Subsidiary Guarantor of (a) any Equity Interests of any of the
      Subsidiaries (other than directors' qualifying shares) or (b) any other
      assets of the Borrower or any of the Subsidiaries (other than (i)
      inventory, excess, damaged, obsolete or worn out assets, scrap and
      Permitted Investments, in each case disposed of in the ordinary course of
      business, (ii) dispositions between or among Foreign Subsidiaries, (iii)
      dispositions of Approved Margin Stock or (iv) dispositions of Third Party
      Government Receivables pursuant to any Third Party Financing), provided
      that any asset sale or series of related asset sales described in clause
      (b) above having a value not in excess of $250,000 shall be deemed not to
      be an "Asset Sale" for purposes of this Agreement."

      (c) The definition of "Ineligible Receivables" in Section 1.01 of the
Credit Agreement is hereby amended by (i) deleting the word "or" at the end of
clause (e) thereof and (ii) deleting the period at the end thereof and
substituting therefor the phrase ";or (g) Third Party Government Receivables."

      SECTION 2. Amendment to Section 6.02. Section 6.02 of the Credit Agreement
is hereby amended by (a) deleting the word "and" at the end of paragraph (k)
thereof, (b) deleting the period at the end of paragraph (1) thereof and
substituting "; and" therefor and (c) adding the following paragraph at the end
thereof:

      "(m) any Lien on Third Party Government Receivables purporting to be sold
      pursuant to a Third Party Financing in favor of the provider thereof."

      SECTION 3. Further Assurances. The Required Lenders hereby authorize the
Agents to execute any and all further documents, financing statements, releases,
agreements and instruments as the Borrower may reasonably request in order to
effectuate any Third Party Financing as contemplated by this Amendment.

<PAGE>
                                                                               3

      SECTION 4. 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 and the Documentation Agents 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 5. Effectiveness. This Amendment shall become effective as of the
date first written above on the date on which 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 or the
Documentation Agents 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 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.

<PAGE>
                                                                               4

      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 hereto
hereby acknowledges receipt and notice of, and consents to the terms of, this
Amendment.

<PAGE>
                                                                               5

            IN W1TNESS 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 CORPORATION,

                                                by  /s/ Carlton B. Crenshaw
                                                   -----------------------------
                                                   Name:  Carlton B. Crenshaw
                                                   Title: Sr. V.P. Finance and
                                                          Admin.

                                             ANALYSIS & TECHNOLOGY, INC.,

                                                by  /s/ Carlton B. Crenshaw
                                                   -----------------------------
                                                   Name:  Carlton B. Crenshaw
                                                   Title: Vice President

                                             INTERACTIVE MEDIA CORP.,

                                                by  /s/ David M. Nolf
                                                   -----------------------------
                                                   Name:  David M. Nolf
                                                   Title: Secretary

                                             TECHMATICS, INC.,

                                                by  /s/ Carlton B. Crenshaw
                                                   -----------------------------
                                                   Name:  Carlton B. Crenshaw
                                                   Title: Vice President

                                             VECTOR DATA SYSTEMS, INC.

                                                by  /s/ Carlton B. Crenshaw
                                                   -----------------------------
                                                   Name:  Carlton B. Crenshaw
                                                   Title: Vice President

<PAGE>

                                                              SIGNATURE PAGE TO
                                                              AMENDMENT NO. 1
                                                              DATED AS OF
                                                              JANUARY 13, 2000
                                                              TO ANTEON
                                                              CORPORATION CREDIT
                                                              AGREEMENT

NAME OF INSTITUTION: __________________________

                     by _______________________
                        Name:
                        Title:

<PAGE>

            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 CORPORATION,

                                   by  /s/ Carlton B. Crenshaw
                                      ---------------------------------
                                      Name:  Carlton B. Crenshaw
                                      Title: Sr. V.P. Finance and Admin.

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

                                   by /s/ ROBERT HETU
                                      ---------------------------------
                                      Name: ROBERT HETU
                                      Title: VICE PRESIDENT

                                   by /s/ Joel Glodowski
                                      ---------------------------------
                                      Name: Joel Glodowski
                                      Title: Managing Director

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

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

<PAGE>

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

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

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

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

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

                                   DEUTSCHE BANK AG, New York Branch, as
                                   Documentation Agent,

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

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

                                   DEUTSCHE BANK AG, New York and/or
                                   Cayman Islands Branches, as Lender,

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

<PAGE>

                                                              SIGNATURE PAGE TO
                                                              AMENDMENT NO. 1
                                                              DATED AS OF
                                                              JANUARY 13, 2000
                                                              TO ANTEON
                                                              CORPORATION CREDIT
                                                              AGREEMENT

NAME OF INSTITUTION:
                     ------------------------------------
                     FLEETNATIONAL BANK
                     BOSTON, MASSACHUSETTS

                     by /s/ Roger C. Boucher
                        ---------------------------------
                        Name: Roger C. Boucher
                        Title: Senior Vice President

<PAGE>

                                                              SIGNATURE PAGE TO
                                                              AMENDMENT NO. 1
                                                              DATED AS OF
                                                              JANUARY 13, 2000
                                                              TO ANTEON
                                                              CORPORATION CREDIT
                                                              AGREEMENT

NAME OF INSTITUTION: IBM Credit Corporation
                     ------------------------------------

                     by /s/ Ronald J. Bachner
                        ---------------------------------
                        Name: Ronald J. Bachner,
                        Title: Manager, Commercial Financing
                               Solutions Americas

<PAGE>

                                                              SIGNATURE PAGE TO
                                                              AMENDMENT NO. 1
                                                              DATED AS OF
                                                              JANUARY 13, 2000
                                                              TO ANTEON
                                                              CORPORATION CREDIT
                                                              AGREEMENT

NAME OF INSTITUTION: PNC BANK, NATIONAL ASSOCIATION
                     ------------------------------------

                     by /s/ Daniel J. Paull
                        ---------------------------------
                        Name: Daniel J. Paull
                        Title: Vice President

<PAGE>

                                                              SIGNATURE PAGE TO
                                                              AMENDMENT NO. 1
                                                              DATED AS OF
                                                              JANUARY 13, 2000
                                                              TO ANTEON
                                                              CORPORATION CREDIT
                                                              AGREEMENT

NAME OF INSTITUTION: TRANSAMERICA BUSINESS CREDIT CORPORATION
                     ------------------------------------

                     by /s/ Perry Vavoules
                        ---------------------------------
                        Name: Perry Vavoules
                        Title: Senior Vice President

<PAGE>

                                                              SIGNATURE PAGE TO
                                                              AMENDMENT NO. 1
                                                              DATED AS OF
                                                              JANUARY 13, 2000
                                                              TO ANTEON
                                                              CORPORATION CREDIT
                                                              AGREEMENT

NAME OF INSTITUTION: BANK POLSKA KASA OPIEKI S.A., NEW YORK BRANCH
                     ------------------------------------

                     by /s/ HUSSEIN B. EL-TAWIL
                        ---------------------------------
                        Name: HUSSEIN B. EL-TAWIL
                        Title: VICE PRESIDENT

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00026-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00026-of-00352.parquet"}]]