Document:

<PAGE>   1
                                                                   EXHIBIT 10.7

                   SIXTH MODIFICATION TO AMENDED AND RESTATED
                      BUSINESS LOAN AND SECURITY AGREEMENT

              THIS SIXTH MODIFICATION TO AMENDED AND RESTATED BUSINESS LOAN AND
SECURITY AGREEMENT (this "Modification") is made as of the 2nd day of April,
2001, by and among (i) BANK OF AMERICA, N.A., a national banking association (as
successor-in-interest to NationsBank, N.A.), acting in its capacity as a Lender
("Bank of America"), having an office at 8300 Greensboro Drive, Suite 550,
McLean, Virginia 22102; (ii) Fleet Capital Corporation, a Rhode Island
corporation ("Fleet"), having an office at 300 Galleria Parkway Northwest, Suite
800, Atlanta, Georgia 30339; (iii) each other person or entity hereafter
becoming a "Lender" pursuant to the hereinafter defined Loan Agreement; (iv)
BANK OF AMERICA, N.A., a national banking association (as successor-in-interest
to NationsBank, N.A.), acting in its capacity as Agent for the Lenders, having
an office at 8300 Greensboro Drive, Suite 550, McLean, Virginia 22102; and (v)
BTG, INC., a Virginia corporation ("BTG"); BTG TECHNOLOGY SYSTEMS, INC., a
Virginia corporation ("BTGTECH"); DELTA RESEARCH CORPORATION, a Virginia
corporation ("Delta"); CONCEPT AUTOMATION, INC. OF AMERICA, a Virginia
corporation ("CAI"); NATIONS, INC., a New Jersey corporation ("Nations"); STAC,
INC., a Virginia corporation ("STAC"); RESEARCH PLANNING, INC., a Delaware
corporation ("RPI"), all having principal offices at 3877 Fairfax Ridge Road,
4B, Fairfax, Virginia 22030-7448; and each other person or entity hereafter
executing a "Joinder Agreement" pursuant to the Loan Agreement (collectively,
the "Borrowers" and without RPI, the "Existing Borrowers"). Capitalized terms
used but not defined herein shall have the meanings attributed to such terms in
the Loan Agreement.

                          W I T N E S S E T H  T H A T:

              WHEREAS, pursuant to the terms and conditions of that certain
Amended and Restated Business Loan and Security Agreement dated October 31, 1997
(as heretofore amended or modified, and as the same may be hereafter amended or
modified, the "Loan Agreement"), by and among the Agent, the Existing Borrowers
and the Lenders (including Crestar Bank which is no longer a party thereto), the
Existing Borrowers obtained a loan (the "Loan") from the Lenders in the original
aggregate maximum principal amount of One Hundred Ten Million and No/100 Dollars
($110,000,000.00), which aggregate maximum principal amount had been heretofore
reduced to Fifty Million and No/100 Dollars ($50,000,000.00), but continues to
be evidenced by two (2) separate Replacement Revolving Promissory Notes (as
defined in Exhibit A hereto), in the aggregate maximum principal amount of
Ninety-five Million and No/100 Dollars ($95,000,000.00); and

              WHEREAS, the Loan is secured by, among other things, certain
collateral (the "Collateral") more fully described in Section 1 of Article III
of the Loan Agreement; and

              WHEREAS, pursuant to that certain Fifth Modification to Amended
and Restated Business Loan and Security Agreement dated April 19, 2000, by and
among the Agent, the Existing Borrowers and Lenders, the Existing Borrowers
obtained a term loan (the "SSDS Acquisition Term Loan") in the original
aggregate principal amount of Eight Million and No/100 Dollars ($8,000,000.00),
which term loan was (a) made available to the Borrowers in addition to and not
in replacement of the existing revolving facility ("Facility "A""), (b)
evidenced by two (2) separate Term Promissory Notes (as defined in EXHIBIT A
hereto), in the original aggregate

<PAGE>   2

principal amount of Eight Million and No/100 Dollars ($8,000,000.00), and (c)
secured by, among other things, the Collateral; and

              WHEREAS, the Term Promissory Notes which evidenced the SSDS
Acquisition Term Loan have been paid and satisfied in full; and

              WHEREAS, pursuant to a certain letter agreement dated March 29,
2001 (the "Letter Agreement"), between the Existing Borrowers and the Agent
(acting for and on behalf of the Lenders), the Agent and Lenders (a) consented
to a stock acquisition (the "Acquisition") pursuant to which BTG will acquire
all of the issued and outstanding capital stock of RPI, as described in that
certain Stock Purchase Agreement dated as of March 30, 2001 (the "Stock
Purchase Agreement"), by and among BTG, RPI and the stockholders of RPI; and (b)
agreed to extend to the Borrowers a new term loan ("Facility "B""), in the
original aggregate principal amount of Two Million and No/100 Dollars
($2,000,000.00), the proceeds of which shall be used to finance the Acquisition
and certain costs and expenses incurred in connection therewith; and

              WHEREAS, the Letter Agreement expressly provides that the Agent's
and Lenders' consent to the Acquisition and agreement to make Facility "B"
available to the Borrowers shall be subject to, among other things, the
execution and delivery of this Modification by the Borrowers, Lenders and Agent,
and the terms, covenants, conditions and limitations set forth in this
Modification, as hereinafter provided.

              NOW, THEREFORE, for Ten Dollars ($10.00) and other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:

              1.     The foregoing recitals are hereby incorporated herein by
this reference and made a part hereof, with the same force and effect as if
fully set forth herein.

              2.     Promptly following the Borrowers' written request to the
Agent, the proceeds of Facility "B" shall be fully advanced to the Borrowers;
provided that (a) as of the date of the Borrowers' written request and as of the
date of disbursement, (i) no Event of Default shall have occurred and be
continuing, (ii) and no act, event or condition shall have occurred which with
notice or the lapse of time, or both, would constitute an Event of Default, and
(iii) all of the representations and warranties set forth in the Loan Agreement
are true and correct in all respects, and (b) the Borrowers' written request to
the Agent contains a certification as to the matters set forth in clause (a)
above. The proceeds of Facility "B" shall be used solely for the purpose of
financing the purchase price for the Acquisition and other amounts payable by
BTG pursuant to the Stock Purchase Agreement, as well as the transactional costs
and expenses incurred in connection with the Acquisition. From and after the
initial disbursement of the proceeds of Facility "B", neither the Agent nor any
Lender shall have any further obligation whatsoever to advance or readvance the
proceeds of Facility "B".

              3.     The definitions of "Borrower" and "Borrowers",
"Consolidated Fixed Charges", "Facility "B"", "Facility "B" Commitment Amount"
and "Loan" set forth in the "Certain Definitions" section of the Loan Agreement
are hereby deleted in their entirety and the following substituted in lieu
thereof:

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<PAGE>   3

              ""BORROWER" and "BORROWERS" shall mean, respectively, each and all
              of the following entities: BTG, Inc., a Virginia corporation; BTG
              Technology Systems, Inc., a Virginia corporation; Delta Research
              Corporation, a Virginia corporation; Concept Automation, Inc. of
              America, a Virginia corporation; Nations, Inc., a New Jersey
              corporation; STAC, Inc., a Virginia corporation; Research
              Planning, Inc., a Delaware corporation; and each other person or
              entity hereafter executing a Joinder Agreement pursuant to Section
              9 of Article I of this Agreement.

              "CONSOLIDATED FIXED CHARGES" shall mean, as of the date of the
              particular determination, interest expenses, plus current
              maturities of long term debt, plus current maturities of
              capitalized leases, plus cash payments for taxes for the fiscal
              quarter of the Borrowers most recently ended, calculated on a
              consolidated basis in accordance with GAAP. For purposes hereof,
              current maturities under Facility "B" shall be determined using a
              twenty-four (24) month amortization schedule, calculated from the
              date on which the first installment of principal and interest
              becomes due and payable under the Facility "B" Notes.

              "FACILITY "B"" shall mean the term loan facility being extended
              pursuant to this Agreement, in the original aggregate principal
              amount of Two Million and No/100 Dollars ($2,000,000.00).

              "FACILITY "B" COMMITMENT AMOUNT" shall mean Two Million and No/100
              Dollars ($2,000,000.00)."

       4.     The following definitions of "RPI Seller Notes", "RPI Stock
Purchase Agreement" and "RPI Subordination Agreement" are hereby added to the
"Certain Definitions" section of the Loan Agreement:

              ""RPI SELLER NOTES" shall mean, individually or collectively at
              the context may require, that certain (a) Subordinated Promissory
              Note dated April 2, 2001, made by BTG and payable to the order of
              Reynaldo P. Maduro, Sr., in the original principal amount of Six
              Million Seven Hundred Fifty Thousand and No/100 Dollars
              ($6,750,000.00), (b) Subordinated Promissory Note dated April 2,
              2001, made by BTG and payable to the order of Charles H. Lyon,
              III, in the original principal amount of One Million Eight Hundred
              Thousand and No/100 Dollars ($1,800,000.00), (c) Subordinated
              Promissory Note dated April 2, 2001, made by BTG and payable to
              the order of Grant C. Peterson, in the original principal amount
              of Four Hundred Fifty Thousand and No/100 Dollars ($450,000.00),
              and (d) any and all extensions, renewals, modifications,
              replacements, and/or substitutions of or for any of the foregoing
              approved in writing by the Agent.

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<PAGE>   4

              "RPI STOCK PURCHASE AGREEMENT" shall mean that certain Stock
              Purchase Agreement dated as of March 30, 2001, among BTG, RPI,
              Reynaldo P. Maduro, Sr., Charles H. Lyon, III, and Grant C.
              Peterson, together with all amendments or modifications thereof
              approved in writing by the Agent.

              "RPI SUBORDINATION AGREEMENT" shall mean that certain
              Subordination Agreement dated as of April 2, 2001, by and among
              BTG, RPI, Reynaldo P. Maduro, Sr., Charles H. Lyon, III, Grant C.
              Peterson and the Agent, together with all amendments or
              modifications thereof."

       5.     The definition of "Net Cash Flow" set forth in the "Certain
Definitions" section of the Loan Agreement is hereby deleted in its entirety.

       6.     Section 5 of Article I of the Loan Agreement is hereby deleted in
its entirety and the following substituted in lieu thereof:

              "5.    ADDITIONAL MANDATORY PAYMENTS; REDUCTION OF COMMITMENT. In
              addition to all other sums payable by the Borrowers pursuant to
              any of the Notes, this Agreement or any other Loan Document, the
              Borrowers shall also make mandatory payments under the Facility
              "B" Notes, to be applied in inverse order of maturity under the
              Facility "B" Notes, in the amount of one hundred percent (100%) of
              (a) any and all payments made under the Installment Note; and (b)
              the cash proceeds (net of reasonable and customary costs paid to
              unrelated and unaffiliated third parties in connection with the
              particular transaction) arising from the sale or disposition by
              BTG of the Installment Note. Any mandatory payment required
              pursuant to clauses (a) and/or (b) above shall be due and payable
              in full simultaneously with the occurrence of the event giving
              rise to such mandatory payment (i.e., a payment under the
              Installment Note, or a sale or other disposition of the
              Installment Note)."

       7.     Section 15(a) of Article VI of the Loan Agreement is hereby
deleted in its entirety and the following substituted in lieu thereof:

              "(a)   TANGIBLE NET WORTH. As of March 31, 2001, the Borrowers
              shall have Tangible Net Worth of not less than Eight Million Five
              Hundred Thousand and No/100 Dollars ($8,500,000.00). Thereafter,
              the Borrowers, on a consolidated basis, will maintain at all times
              Tangible Net Worth of not less than the sum of (i) Eight Million
              Five Hundred Thousand and No/100 Dollars ($8,500,000.00), plus
              (ii) sixty-seven percent (67%) of net income arising after March
              31, 2001 (not to be reduced for subsequently incurred losses), as
              determined on a consolidated basis in accordance with GAAP at the
              end of each fiscal quarter. For purposes of this Agreement,
              "Tangible Net Worth" shall mean all capital stock, paid in capital
              and retained earnings, less all

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              treasury stock, amounts due from officers, directors, stockholders
              and members of their immediate families, amounts due from
              affiliates (to the extent such amounts are part of the Borrowers'
              consolidated net worth), investments in non-marketable securities,
              notes receivable of affiliates (to the extent that such amounts
              are part of the Borrowers' consolidated net worth), leasehold
              improvements, goodwill, non-competition agreements, capitalized
              organization and development costs, capitalized expenses, loan
              costs, patents, trademarks, copyrights, franchises, licenses and
              other intangible assets."

       8.     Section 10 of Article VII of the Loan Agreement is hereby deleted
in its entirety and the following substituted in lieu thereof:

              "10.   CAPITAL EXPENDITURES. On a consolidated basis make any cash
              investment or cash capital expenditure, including but not limited
              to, expenditures for leasehold improvements or the acquisition of
              the assets of any other firm, person, company, corporation or
              enterprise, during any of the Borrowers' fiscal year in excess of
              Two Million and No/100 Dollars ($2,000,000.00); "

       9.     By executing this Modification, RPI hereby (i) agrees to become a
"Borrower" under the Loan Agreement; (ii) joins in, becomes a party to, and
agrees to comply with and be bound by the terms and conditions of the Loan
Agreement and each and every other Loan Document, to the same extent as if RPI
were an original signatory thereto; (iii) grants and conveys to the Agent, for
the ratable benefit of the Lenders, a valid and enforceable security interest in
and to all of its assets constituting Collateral, free and clear of all liens,
claims and encumbrances (other than Permitted Liens and any other liens
expressly approved in writing by the Agent); and (iv) makes all of the
representations and warranties set forth in the Loan Agreement and each other
Loan Document. RPI shall hereafter be jointly and severally liable for the
performance of any and all past, present and future obligations of any Borrower
in connection with any of the Notes, the Loan Agreement and/or the other Loan
Documents. RPI hereby represents and warrants to the Agent and each Lender that
in accordance with the terms of a certain Second Amendment to Amended and
Restated Contribution Agreement of even date herewith (the "Second Amendment to
Contribution Agreement"), RPI has become a party to the Contribution Agreement
and that the Contribution Agreement (as heretofore amended or modified) remains
unmodified and in full force and effect. RPI further hereby represents and
warrants to the Agent and each Lender that both prior to and after giving effect
to the transactions contemplated by the terms and provisions of this
Modification, RPI (a) owned and owns property (including, without limitation,
contribution rights against the other Borrower(s), evidence of which, if
required by the Agent as a condition precedent to the transactions contemplated
hereby, must be in form and substance reasonably satisfactory to the Agent)
whose fair salable value is greater than the amount required to pay all of RPI's
Indebtedness (including contingent debts), (b) was and is able to pay all of its
Indebtedness as such Indebtedness matures, and (c) had and has capital
sufficient to carry on its business and transactions and all business and
transactions in which it is about to engage. For purpose hereof, "Indebtedness"
means, without duplication (i) all items which in accordance with GAAP would be
included in determining total liabilities as shown on the liability side of
RPI's balance sheet, as of the date on which Indebtedness is to be determined,
(ii) all obligations of any other person or entity which

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RPI has guaranteed, (iii) reimbursement obligations in connection with letters
of credit issued for RPI's benefit, and (iv) the Obligations (after giving
effect to RPI's rights under the Contribution Agreement).

       10.    Each Borrower hereby represents and warrants to the Agent and the
Lenders that (a) all of the assets of RPI (the "RPI Assets") are free and clear
of any and all liens, claims and encumbrances (other than Permitted Liens); (b)
all of the RPI Assets constituting accounts, accounts receivable and books and
records (as such terms may be defined in the Virginia Uniform Commercial Code)
are, as of the date hereof, located at BTG's address set forth in the Preamble
to this Modification, and all other RPI Assets are, as of the date hereof,
located at one or more of the locations set forth on SCHEDULE 1 attached to this
Modification; and (c) immediately following the Acquisition, the Agent (for the
ratable benefit of the Lenders) shall have a valid and perfected first priority
security interest in and to all of the RPI Assets (without further
documentation) pursuant to the Loan Agreement and the UCC Financing Statements
to be executed by RPI on the date hereof and filed in the appropriate
jurisdiction necessary to perfect a security interest in and to the RPI Assets.

       11.    The Borrowers acknowledge and agree that (a) neither the Stock
Purchase Agreement nor any of the RPI Seller Notes shall be altered, modified or
amended in any respect without the Agent's prior written consent; (b) a default
under the RPI Subordination Agreement or the failure of any party thereto (other
than the Agent) to observe or perform any of its respective covenants or
obligations set forth therein shall constitute an Event of Default under the
Loan Agreement.

       12.    In consideration of the transactions contemplated by this
Modification, the Borrowers shall pay to the Agent, for the benefit of the
Lenders (pro rata based on each Lender's Percentage), a modification fee in the
amount of Forty Thousand and No/100 Dollars ($40,000.00), which fee shall be
paid in cash on or before the date of this Modification. The Borrowers shall
also pay all of the Agent's costs and expenses associated with this Modification
and the transactions referenced herein or contemplated hereby, including,
without limitation, the Agent's reasonable legal fees and expenses.

       13.    Each Borrower hereby acknowledges, agrees, represents and warrants
that, as of the date hereof (i) there are no set-offs or defenses against the
Notes, the Loan Agreement or any other Loan Document; (ii) except as
specifically amended hereby, all of the terms and conditions of the Notes, the
Loan Agreement and the other Loan Documents shall remain unmodified and in full
force and effect; (iii) the Notes, the Loan Agreement (as modified hereby) and
the other Loan Documents are hereby expressly approved, ratified and confirmed;
(v) the execution, delivery and performance by each Borrower of this
Modification and its obligations hereunder (a) is within its corporate powers,
(b) has been duly authorized by all necessary corporate action, and (c) does not
require the consent or approval of any other person or entity; and (vi) it
continues to be in good standing under the laws of its state of incorporation
and remains duly qualified to do business in all other jurisdictions in which
foreign qualification is necessary or appropriate.

       14.    This Modification shall be governed by the laws of the
Commonwealth of Virginia and shall be binding upon and inure to the benefit of
the parties hereto and their respective successors and assigns.

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<PAGE>   7

       15.    This Modification may be executed in any number of counterparts,
each of which shall be deemed an original and all of which together shall be
deemed one and the same instrument.

                  [Remainder of Page Intentionally Left Blank]

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<PAGE>   8

              IN WITNESS WHEREOF, the undersigned have signed, sealed and
delivered this Modification on the day and year first above written.

<TABLE>
<S>                                                          <C>
                                                              BORROWERS:
                                                              ---------
[Corporate Seal]                                              BTG, INC., a Virginia corporation
ATTEST:

By:  /s/ Marilynn D. Bersoff                                  By:   /s/ Edward H. Bersoff
    --------------------------------                             --------------------------------
Name:    Marilynn D. Bersoff                                  Name:    Edward H. Bersoff
Title:   Secretary                                            Title:   President and CEO

[Corporate Seal]                                              BTG TECHNOLOGY SYSTEMS, INC.,
ATTEST:                                                       a Virginia corporation

By:  /s/ Marilynn D. Bersoff                                  By:   /s/ Edward H. Bersoff
   ---------------------------------                             --------------------------------
Name:    Marilynn D. Bersoff                                  Name:    Edward H. Bersoff
Title:   Secretary                                            Title:   President

[Corporate Seal]                                              DELTA RESEARCH CORPORATION,
ATTEST:                                                       a Virginia corporation

By:  /s/ Marilynn D. Bersoff                                  By:   /s/ Edward H. Bersoff
   ---------------------------------                             --------------------------------
Name:    Marilynn D. Bersoff                                  Name:    Edward H. Bersoff
Title:   Secretary                                            Title:   CEO

[Corporate Seal]                                              CONCEPT AUTOMATION, INC. OF
ATTEST:                                                       AMERICA, a Virginia corporation

By:  /s/ Marilynn D. Bersoff                                  By:   /s/ Edward H. Bersoff
   ---------------------------------                             --------------------------------
Name:    Marilynn D. Bersoff                                  Name:    Edward H. Bersoff
Title:   Secretary                                            Title:   CEO

[Corporate Seal]                                              NATIONS, INC.,
ATTEST:                                                       a New Jersey corporation

By:  /s/ Marilynn D. Bersoff                                  By:   /s/ Edward H. Bersoff
   ---------------------------------                             --------------------------------
Name:    Marilynn D. Bersoff                                  Name:    Edward H. Bersoff
Title:   Secretary                                            Title:   President and CEO
</TABLE>

                  [Signatures Continued on the Following Page]

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<PAGE>   9

<TABLE>
<S>                                                           <C>
[Corporate Seal]                                              STAC, INC., a Virginia corporation
ATTEST:

By:  /s/ Deborah Fox                                          By:   /s/ Edward H. Bersoff
   ---------------------------------                             --------------------------------
Name:    Deborah Fox                                          Name:    Edward H. Bersoff
Title:   Secretary                                            Title:   CEO

[Corporate Seal]                                              RESEARCH PLANNING, INC., a
ATTEST:                                                       Delaware corporation

By:  /s/ Deborah Fox                                          By:   /s/ Edward H. Bersoff
   ---------------------------------                             --------------------------------
Name:    Deborah Fox                                          Name:    Edward H. Bersoff
Title:   Secretary                                            Title:   CEO

                                                              AGENT:
                                                              -----
                                                              BANK OF AMERICA, N.A., a national banking association (as
                                                              successor-in-interest to NationsBank, N.A.), acting in its capacity
                                                              as Agent

                                                              By:   /s/ Lawrence J. Shufelt
                                                                 --------------------------------
                                                              Name:    Lawrence J. Shufelt
                                                              Title:   Vice President

                                                              LENDER(S):
                                                              ---------

                                                              BANK OF AMERICA, N.A., a national banking association (as
                                                              successor-in-interest to NationsBank, N.A.), acting in its capacity
                                                              as Lender

                                                              By:   /s/ Lawrence J. Shufelt
                                                                 --------------------------------
                                                              Name:    Lawrence J. Shufelt
                                                              Title:   Vice President

                                                              FLEET CAPITAL CORPORATION, a
                                                              Rhode Island corporation

                                                              By:   /s/ Sharon Garner
                                                                 --------------------------------
                                                              Name:    Sharon Garner
                                                              Title:   Vice President
</TABLE>

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<PAGE>   10

                                    EXHIBIT A

For purposes of this Modification, the following terms shall have the following
meanings:

"Contribution Agreement" means that certain Amended and Restated Contribution
Agreement dated as of October 31, 1997, by and among certain of the Existing
Borrowers, as amended by a First Amendment dated as of January 26, 1999, and a
Second Amendment dated as of April 2 , 2001.

"Replacement Revolving Promissory Notes" shall mean each and all of the
promissory notes executed, issued and delivered pursuant to the Loan Agreement
in connection with Facility "A", together with all extensions, renewals,
modifications and substitutions thereof and therefor.

 "Term Promissory Notes" shall mean each and all of the promissory notes
executed, issued and delivered pursuant to the Loan Agreement in connection with
the SSDS Acquisition Term Loan.

<PAGE>   11

                                   SCHEDULE 1

                              [RPI Asset Locations]

                                       2<PAGE>   1
                                                                   EXHIBIT 10.15

                                    EMPLOYMENT AGREEMENT

        THIS EMPLOYMENT AGREEMENT (this "Agreement") is made effective for all
purposes and in all respects as of the 1st day of December 1, 2000, by and
between (a) BTG, INC., a Virginia corporation, (hereinafter referred to as
"Employer"), and (b) Thomas W. Weston, Jr., Senior Vice President, Chief
Financial Officer (hereinafter referred to as "Employee").

        WHEREAS, Employer and Employee previously entered into an employment
agreement effective April 1, 2000 (the "Prior Agreement");

        WHEREAS, Employer desires to continue to employ Employee in the capacity
of a Senior Vice President, Chief Financial Officer;

        WHEREAS, Employee desires to continue to be employed by Employer in the
aforesaid capacity; and

        WHEREAS, Employer and Employee desire to enter into this Agreement,
which shall supercede the Prior Agreement and set forth the terms and conditions
of Employee's continued employment with Employer during the term hereof.

        NOW, THEREFORE, in consideration of the foregoing, of the mutual
promises herein contained, and of other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereto,
intending legally to be bound, hereby agree as follows:

        1.      Term.  The term of employment under this Agreement (the "Term")
shall be for the period commencing on the effective date hereof and ending on
March 31, 2004.

        2.      Duties of Employee. Subject to the provisions of this Agreement,
during the Term, Employer shall employ Employee and Employee shall serve
Employer as a Senior Vice President, Chief Financial Officer. During the Term,
Employee shall discharge the obligations and responsibilities normally
associated with such office and shall perform such other duties and
responsibilities as the Employer shall determine from time to time that are
consistent with Employee's position and the terms of this Agreement.

        3.      Compensation. Employee will receive an annual base salary of not
less than the salary specified on Exhibit A hereto ("Base Salary"). Base Salary
and merit increases to such Base Salary will be payable at the times and in the
manner consistent with Employer's general policies regarding compensation of
executive employees. In the event that Employee shall be given significant new
or additional responsibilities (without a corresponding decrease in existing
responsibilities) at any time during the Term, Employer and Employee agree to
discuss the amount, if any, of increase in Employee's Base Salary. Employee will
be eligible to receive annual incentive compensation based on incentive target
percentages of base salary comparable to such percentages in effect immediately
prior to the effective date of the Agreement. Nothing in this Section will
guarantee to Employee any specific amount of

<PAGE>   2

incentive compensation, or prevent the Employer from establishing new
performance goals and compensation targets applicable to Employee.

        4.      Additional Benefits. In addition to the compensation referred to
in Section 3 hereof, Employee shall be entitled to receive such health, medical,
disability, dependent health care, life, retirement and other employee benefits
as Employer generally makes available to its executive officers.

        5.      Termination.

                A.      Termination Without Cause.  Either Employee or Employer
may terminate this Agreement and Employee's employment hereunder at any time
without cause by giving not less than thirty (30) days advanced written notice
to the other party.

                B.      Termination for Cause. Employer may terminate this
Agreement and Employee's employment hereunder for Cause (as hereinafter defined)
by giving written notice of such termination to Employee. For purposes of this
Agreement, "Cause" shall mean: Employee's willful and gross misconduct which
has, or could reasonably be expected to have, a material adverse effect on the
business, assets, operations, results of operations or financial condition of
Employer. If Employer shall elect to terminate this Agreement and Employee's
employment hereunder for Cause, Employer shall provide written notice thereof to
Employee within sixty (60) days after the occurrence of the event upon which
such right of termination for Cause arises. A termination for Cause pursuant
hereto shall take effect ten days after the delivery of such written notice to
Employee unless Employee shall, during such ten day period, remedy the Cause
specified in such notice; provided however, that such termination shall take
effect immediately upon the giving of such notice if the Board of Directors
specifically determines in good faith that such Cause is unremediable.

                C.      Death and Disability. This Agreement and Employee's
employment hereunder shall automatically terminate upon the death of Employee,
and also may be terminated by Employer by giving written notice of such
termination to Employee if Employee shall be rendered incapable by illness or
any physical or mental disability from substantially complying with the terms,
conditions and provisions on his part to be observed and performed for a period
in excess of six (6) consecutive months during the Term.

                D.      Termination for Good Reason. At any time within two (2)
years following a Change in Control (as hereinafter defined), Employee may
terminate this Agreement and Employee's employment hereunder for Good Reason (as
hereinafter defined) by giving written notice of such termination to Employer.
For purposes of this Agreement, "Good Reason" shall mean any of the following:
(a) the Employer requests that the Employee provide services that are not of a
similar character to those provided by the Employee to the Employer immediately
prior to the Change in Control; (b) the Employer has breached any material
provision of this Agreement and within 30 days after notice thereof from the
Employee, the Employer fails to cure such breach; or (c) the Employer requires
the Employee to relocate his principal place of employment to any location
outside a twenty-five mile radius from the location of the

                                       2
<PAGE>   3

Employee's principal place of employment immediately prior to the date of the
Change in Control. If Employee shall elect to terminate this Agreement and
Employee's employment hereunder for Good Reason, Employee shall provide written
notice thereof to Employer within sixty (60) days after the occurrence of the
event upon which such right of termination for Good Reason arises. A termination
for Good Reason pursuant hereto shall take effect ten days after the delivery of
such written notice to Employer unless Employer shall, during such ten day
period, remedy the Good Reason specified in such notice.

                        A "Change in Control" for purposes of this Agreement
shall mean (a) the sale of substantially all of Employer's assets to a single
purchaser or group of associated purchasers; (b) the sale, exchange, or other
disposition, in one transaction or a series of related transactions, of the
majority of Employer's outstanding corporate shares; or (c) the merger or
consolidation of Employer with another unrelated company where Employer is not
the surviving entity in such merger or consolidation. As used in this Agreement,
"Employer" shall mean Employer as herein before defined and any successor to its
business and/or assets in a Change in Control transaction.

        6.      Termination Payments and Benefits.

                A.      Termination Upon Change in Control. If during the Term
there shall occur a Change in Control (as hereinafter defined), and within two
(2) years after such Change in Control Employer shall terminate Employee without
Cause, or Employee shall terminate employment with Employer for Good Reason
pursuant to Section 5(D) above, then Employer will pay to Employee an amount
equal to 265% of Base Salary. Any amount due pursuant to this Section will be
payable in a lump sum less applicable taxes within 30 days following
termination; provided, however, that the payment of any such amount shall be
conditioned upon Employee's execution of a general release of and waiver of
claims against Employer in form and substance satisfactory to Employer.

                B.      Termination Without Cause. If during the Term Employer
shall terminate Employee without Cause and the provisions of Section 6(A) above
are not applicable to such termination, then Employer will pay to Employee an
amount equal to 133% of Base Salary. Any amount due pursuant to this Section
will be payable in a lump sum less applicable taxes within 30 days following
termination; provided, however, that the payment of any such amount shall be
conditioned upon Employee's execution of a general release of and waiver of
claims against Employer and the Employer in form and substance satisfactory to
Employer and the Employer.

                C.      Other Events of Termination. In the event that
Employee's employment hereunder is terminated by reason of Employee's voluntary
resignation (as provided in Section 5(A)), by Employer for Cause (as provided in
Section 5(B)), or Employee's death or disability (as provided in Section 5(C)),
all accrued Base Salary shall be paid to Employee (or, in the event of
Employee's death, to Employee's estate), but no compensation (or other payments)
in excess of such accrued but unpaid Base Salary, shall then be paid or payable
to Employee (or to his estate) under this Agreement.

                                       3
<PAGE>   4

                D.      Excise Tax Restoration Payment.  In the event that it is
determined that any payment or distribution of any type to or for the benefit of
Employee made by Employer, by any of its affiliates, by any person who acquires
ownership or effective control or ownership of a substantial portion of
Employer's assets (within the meaning of section 280C of the Internal Revenue
Code of 1986, as amended, and the regulations thereunder (the "Code")) or by any
affiliate of such person, whether paid or payable or distributed or
distributable pursuant to the terms of an employment agreement or otherwise (the
"Total Payments"), would be subject to the excise tax imposed by Section 4999 of
the Code or any interest or penalties with respect to such excise tax (such
excise tax, together with any such interest or penalties, are collectively
referred to as the "Excise Tax"), then Employee shall be entitled to receive an
additional payment (an "Excise Tax Restoration Payment") in an amount that shall
fund the payment by the Employee of any Excise Tax on the Total Payments as well
as all income taxes imposed on the Excise Tax Restoration Payment, any Excise
Tax imposed on the Excise Tax Restoration Payment and any interest or penalties
imposed with respect to taxes on the Excise Tax Restoration or any Excise Tax.

        7.      Director and Officer Liability. Employer agrees to indemnify
Employee in connection with his serving as an officer of Employer, in a manner
consistent with Employer's Articles of Incorporation, Bylaws and the practices
and policies of Employer in effect from time to time during the Term. In the
event that Employer shall enter into any indemnification agreement with any
officer of Employer or any subsidiary of Employer, Employer shall promptly enter
into an agreement containing similar provisions with respect to indemnification
with Employee.

        8.      Competition, Confidentiality, Nonsolicitation.

                A.      Covenant Not to Compete; Nonsolicitation. Employee
covenants and agrees that at all times during the period of his employment with
Employer and ending upon the earlier of (i) one (1) year after termination of
Employee's employment with Employer pursuant to which Employee is entitled to a
termination payment pursuant to Section 6(A) or (B) of this Agreement, or (ii)
six (6) months after termination of Employee's employment with Employer pursuant
to which Employee is not entitled to a termination payment pursuant to Section
6(A) or (B) of this Agreement, Employee shall not, directly or indirectly in
competition with the business of Employer or its affiliates: participate in the
management of any business enterprise if such enterprise engages in substantial
and direct competition with Employer and such enterprise's sales of any product
or service competitive with any product or service of Employer amounted to 25%
of such enterprise's net sales for its most recently completed fiscal year and
if Employer's net sales of said product or service amounted to 25% of Employer's
net sales for its most recently completed fiscal year. Competition will not
include (i) the mere ownership of securities in any enterprise and exercise of
rights appurtenant thereto or (ii) participation in management of any enterprise
or business operation thereof other than in connection with the competitive
operation of such enterprise.

                                       4
<PAGE>   5

                B.      Confidentiality. The parties hereto acknowledge that
Employer has and will continue to disclose to Employee its confidential or
proprietary information. Employee hereby covenants and agrees that he will not,
without the prior written consent of Employer during the Term or thereafter,
disclose to any person not employed by Employer, or use in connection with
engaging in Competition with employer, any confidential or proprietary
information of Employer. For purposes of this Agreement, the term "confidential
or proprietary information" will include all information of any nature and in
any form that is owned by Employer and that is not publicly available or
generally known to persons engaged in businesses similar or related to those of
Employer. Confidential information will include, without limitation, Employer's
financial matters, customers, employees, industry contacts, and all other
secrets and all other information of a confidential or proprietary nature.
Confidential information shall not include information that comes into the
possession of Employee following termination from a source not under a duty to
Employer to refrain from disclosing such information. The foregoing obligations
imposed by this Section will cease if such confidential or proprietary
information will have become, through no fault of the Employee, generally known
to the public or Employer is required by law to make disclosure (after giving
Employer notice and an opportunity to contest such requirement).

                C.      Nonsolicitation.  Employee covenants and agrees that at
all times during the period of his employment with Employer and for a period of
one (1) year after termination of Employee's employment he will not attempt to
influence, persuade or induce, or assist any other person in so persuading or
inducing, any employee of Employer to give up, or to not commence, employment or
a business relationship with Employer or the Employer.

                D.      Severability; Injunctive Relief. The covenants contained
in this Section 8 shall be construed as a series of separate and severable
covenants which are identical in terms except for geographic coverage. Employee
and Employer agree that if in any proceeding, the tribunal shall refuse to
enforce fully any covenants contained herein because such covenants cover too
extensive a geographic area or too long a period of time or for any other reason
whatsoever, any such covenant shall be deemed amended to the extent (but only to
the extent) required by law. Each party acknowledges and agrees that the
services to be rendered by Employee to Employer hereunder are of a special and
unique character. Each party shall have the right to injunctive relief, in
addition to all of its other rights and remedies at law or in equity, to enforce
the provisions of this Agreement.

                E.      The obligations of Employee under this Section 8 shall
survive the termination or expiration of the Employment Term.

                                       5
<PAGE>   6

        9.      Proprietary Rights.

                A.      All right, title, and interest in all copyrightable
material which Employee shall conceive or originate, either individually or
jointly with others, and which arise out of Employee's employment with Employer,
is the property of Employer and is by this Agreement assigned to Employer along
with ownership of any and all copyrights in the copyrightable material. Employee
agrees to execute all papers and perform all other acts necessary to assist
Employer to obtain and register copyrights on such materials in any and all
countries. Works of authorship created by Employee for Employer in performing
his responsibilities under this Agreement shall be considered "works made for
hire" as defined in the U.S. Copyright Act. In addition, Employee hereby assigns
to Employer all proprietary rights including, but not limited to, all patents,
copyrights, trade secrets and trademarks Employee might otherwise have, by
operation of law or otherwise, in all inventions, discoveries, works, ideas,
information, knowledge and data related to Employee's access to confidential
information of Employer.

                B.      All know-how and trade secret information conceived or
originated by Employee which arises out of Employee's employment with Employer
shall be the property of Employer, and all rights therein are by this Agreement
assigned to Employer.

                C.      If Employee is engaged in or associated with the
planning or implementing of any project, program or venture involving Employer
and a third party or parties all rights in such project, program or venture
shall belong to Employer. Except as formally approved by Employer's Board of
Directors, Employee shall not be entitled to any interest in such project,
program or venture or to any commission, finder's fee or other compensation in
connection therewith other than the compensation to be paid to Employee as
provided in this Agreement.

                D.      Upon termination of his employment with Employer,
Employee shall deliver promptly to Employer all records, manuals, books, blank
forms, documents, letters, memoranda, notes, notebooks, reports, data, tables,
calculations, customer and prospective customer lists, and copies of all of the
foregoing, which are the property of Employer, and all other property, trade
secrets and confidential information of Employer, including, but not limited to,
all documents which in whole or in part contain any trade secrets or
confidential information of Employer, which in any of these cases are in his
possession or under his control.

                E.      Employee further agrees to execute and deliver any
additional documents, instruments, applications, affidavits or other writings
reasonably necessary to further evidence the assignments described in this
Section 9.

        10.     Tax Withholding.  Payments to Employee of all compensation
contemplated under this Agreement shall be subject to all applicable legal
requirements with respect to the withholding of taxes or other amounts required
by law or regulation.

        11.     Amendment; Waiver. This Agreement may not be modified, amended
or waived in any manner except by an instrument in writing signed by the parties
hereto. The waiver by

                                       6
<PAGE>   7

either party of compliance with any provision of this Agreement by the other
party shall not operate or be construed as a wavier of any provision of this
Agreement, or of any subsequent breach by such party of a provision of this
Agreement.

        12.     Governing Law. In view of the fact that the principal office of
Employer is located in the Commonwealth of Virginia, it is understood and agreed
that the construction and interpretation of this Agreement shall at all times
and in all respects be governed by the substantive laws of the Commonwealth of
Virginia without regard to its rules regarding conflicts of laws.

        13.     Submission to Jurisdiction. Employee hereby irrevocably submits
to the exclusive jurisdiction of any Virginia court or Federal court sitting in
Fairfax County, Virginia, in any action or proceeding arising out of or relating
to this Agreement or the transactions contemplated hereby, and Employee hereby
irrevocably agrees that all claims in respect of any such action or proceeding
may be heard and determined in any such Virginia or Federal court. Employee
irrevocably consents to the service of any and all process in any such action or
proceeding by the mailing of copies of such process to Employee at its address
specified pursuant to Section 15. Employee irrevocably confirms that service of
process out of such courts in such manner shall be deemed due service upon him
for the purposes of such action or proceeding. Employee and Employer hereby
irrevocably waive (a) any objection such party may have to the laying of venue
of any such action or proceeding in any of such courts, or (b) any claim that
such party may have that any such action or proceeding has been brought in an
inconvenient forum. Employee and Employer irrevocably agree that a final
judgment in any such action or proceeding shall be conclusive and may be
enforced in other jurisdictions by suit on the judgment or in any other manner
provided by law. Nothing in this Section 13 shall affect the right of any party
hereto to serve legal process in any manner permitted by law.

        14.     Severability. The provisions of this Agreement (including
particularly, but not limited to, the provisions of Section 8 hereof) shall be
deemed severable, and the invalidity or unenforceability of any one or more of
the provisions hereof shall not affect the validity and enforceability of the
other provisions hereof.

        15.     Notices. Any notice required to be given hereunder shall be
sufficient if in writing, and sent by courier service (with proof of service),
facsimile transmission, hand delivery or certified or registered mail (return
receipt requested and first-class postage prepaid), to his residence in the case
of Employee, and to its principal office in the case of Employer.

        16.     Entire Agreement. This Agreement contains the entire agreement
and understanding by and between Employer and Employee with respect to the
employment herein referred to, and no representations, promises, agreements or
understandings, written or oral, not contained herein shall be of any force or
effect.

                                       7
<PAGE>   8

        17.     Successors; Binding Agreement.

                A.      Employer will require any successor of Employer in a
Change in Control transaction to expressly assume and agree to perform this
Agreement in the same manner and to the same extent that Employer would be
required to perform it if no such Change in Control transaction had taken place.
Failure of Employer to obtain such assumption and agreement prior to the
effectiveness of any such Change in Control transaction shall be a breach of
this Agreement and shall entitle Employee to compensation from Employer in the
same amount and on the same terms as he would be entitled to hereunder if
Employee terminated his employment for Good Reason pursuant to Section 5(D)
above, except that for purposes of implementing the foregoing, the date on which
any such Change in Control transaction becomes effective shall be deemed the
date of termination hereunder.

                B.      This Agreement shall be binding upon and shall inure to
the benefit of the parties hereto and their respective heirs, devisees,
executors, administrators, legal representatives, successors and assigns.

        18.     Counterparts.  This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original hereof, and all of which
together shall constitute one and the same instrument.

        IN WITNESS WHEREOF, Employer and Employee have duly executed this
Agreement under seal as of the day and year first above written.

                                         BTG, INC.

                                         By: /s/ Edward H. Bersoff
                                            ----------------------------------
                                            Edward H. Bersoff
                                            President, CEO

                                         EMPLOYEE

                                          /s/ Thomas W. Weston, Jr.
                                         -------------------------------------
                                         Thomas W. Weston, Jr.
                                         Senior Vice President,
                                         Chief Financial Officer

                                       8
<PAGE>   9

                                    Exhibit A

                              Thomas W. Weston, Jr.
                              Senior Vice President
                             Chief Financial Officer

                                   $180,000.00

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