Document:

SUBSIDIARY GUARANTY
AGREEMENT 

        THIS
SUBSIDIARY GUARANTY AGREEMENT, dated as of November 26, 2002, by and among certain
Subsidiaries of DIGITALNET HOLDINGS, INC., a Delaware corporation
(“Holdings”) and DIGITALNET, INC., a Delaware corporation (the
“Borrower”), as identified on the signature pages hereto and any
Additional Guarantor (as defined below) who may become party to this Guaranty (such
Subsidiaries and Additional Guarantors, collectively, the “Guarantors”),
in favor of BANK OF AMERICA, N.A., as Administrative Agent (in such capacity, the
“Administrative Agent”) for the ratable benefit of the banks and other
financial institutions (the “Lenders”) from time to time parties to the
Credit Agreement, dated as of November 26, 2002 (as amended, restated, supplemented or
otherwise modified from time to time, the “Credit Agreement”), by and
among Holdings, the Borrower, the Lenders, and the Administrative Agent. 

STATEMENT OF PURPOSE 

        Pursuant
to the Credit Agreement, the Lenders have agreed to make Credit Extensions to the Borrower
upon the terms and subject to the conditions set forth therein. 

        Holdings,
the Borrower and the Guarantors are part of a related corporate structure and therefore
Credit Extensions to the Borrower will directly benefit the Guarantors through increased
working capital to the entire corporate structure. 

        It
is a condition precedent to the obligation of the Lenders to make their respective Credit
Extensions to the Borrower under the Credit Agreement that the Guarantors shall have
executed and delivered this Guaranty to the Administrative Agent, for the ratable benefit
of itself and the Lenders. 

        NOW,
THEREFORE, in consideration of the premises and the mutual agreements set forth herein,
and to induce the Administrative Agent and the Lenders to enter into and to make available
Credit Extensions pursuant to the Credit Agreement, each Guarantor hereby agrees with the
Administrative Agent for the ratable benefit of the Administrative Agent and the Lenders
as follows: 

ARTICLE I 

DEFINED TERMS 

        1.01    
Defined Terms.  The following  terms when used in this Guaranty shall have the
meanings  assigned to them below: 

        “Additional
Guarantor” means each Domestic Subsidiary of Holdings or the Borrower which
hereafter becomes a Guarantor pursuant to Section 4.15 hereof and Section
7.15 of the Credit Agreement. 

        “Applicable
Insolvency Laws” means all Laws governing bankruptcy, reorganization,
arrangement, adjustment of debts, relief of debtors, dissolution, insolvency, fraudulent
transfers or conveyances or other similar laws (including, without limitation, 11 U.S.C.
Sections 547, 548 and 550 and other “avoidance” provisions of Title 11 of
the United States Code). 

        “Guaranty”
means this Subsidiary Guaranty Agreement, as amended, restated, supplemented or otherwise
modified from time to time. 

        “Subsidiary
Guaranteed Obligations” has the meaning set forth in Section 2.01(a)
hereof. 

        1.02    
Other Definitional Provisions. Terms defined in the Credit Agreement and not
otherwise defined herein shall have the meaning assigned thereto in the Credit Agreement.
The words “hereof,” “herein”, “hereto” and
“hereunder” and words of similar import when used in this Guaranty shall refer
to this Guaranty as a whole and not to any particular provision of this Guaranty, and
Section references are to this Guaranty unless otherwise specified. The meanings given to
terms defined herein shall be equally applicable to both the singular and plural forms of
such terms. Where the context requires, terms relating to the Collateral or any part
thereof, when used in relation to a Guarantor, shall refer to such Guarantor’s
Collateral or the relevant part thereof. 

ARTICLE II 

UNCONDITIONAL GUARANTY 

        2.01    
Terms of the Guaranty. 

        (a)       Guaranty
of Obligations of Guarantors. Each Guarantor hereby, jointly and           severally
with the other Guarantors, unconditionally guarantees to the           Administrative
Agent for the ratable benefit of itself and the Lenders, and           their respective
permitted successors, endorsees, transferees and assigns, the           prompt payment
and performance of all Obligations of the Borrower, whether           primary or
secondary (whether by way of endorsement or otherwise), whether now           existing or
hereafter arising, whether or not from time to time reduced or           extinguished
(except by payment thereof) or hereafter increased or incurred,           whether
enforceable or unenforceable as against the Borrower, whether or not
          discharged, stayed or otherwise affected by any Applicable Insolvency Law or
          proceeding thereunder, whether created directly with the Administrative Agent
or           any Lender or acquired by the Administrative Agent or any Lender through
          assignment, endorsement or otherwise, whether matured or unmatured, whether
          joint or several, as and when the same become due and payable (whether at
          maturity or earlier, by reason of acceleration, mandatory repayment or
          otherwise), in accordance with the terms of any such instruments evidencing any
          such obligations, including all renewals, extensions or modifications thereof
          (all Obligations of the Borrower, including all of the foregoing, being
          hereinafter collectively referred to as the “Subsidiary Guaranteed
          Obligations”).  

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        (b)       Bankruptcy
Limitations on Guarantors. Notwithstanding anything to the           contrary
contained in paragraph (a) above, it is the intention of each Guarantor           and the
Lenders that, in any proceeding involving the bankruptcy,           reorganization,
arrangement, adjustment of debts, relief of debtors, dissolution           or insolvency
or any similar proceeding with respect to any Guarantor or its           assets, the
amount of such Guarantor’s obligations with respect to the           Subsidiary
Guaranteed Obligations shall be in, but not in excess of, the maximum           amount
thereof not subject to avoidance or recovery by operation of Applicable
          Insolvency Laws after giving effect to subsection (c) below. To that end, but
          only in the event and to the extent that after giving effect to subsection (c)
          below such Guarantor’s obligations with respect to the Subsidiary
          Guaranteed Obligations or any payment made pursuant to the Subsidiary
Guaranteed           Obligations would, but for the operation of the first sentence of
this           subsection (b), be subject to avoidance or recovery in any such proceeding
under           Applicable Insolvency Laws after giving effect to subsection (c) below,
the           amount of such Guarantor’s obligations with respect to the Subsidiary
          Guaranteed Obligations shall be limited to the largest amount which, after
          giving effect thereto, would not, under Applicable Insolvency Laws, render such
          Guarantor’s obligations with respect to such Subsidiary Guaranteed
          Obligations unenforceable or avoidable or otherwise subject to recovery under
          Applicable Insolvency Laws. To the extent any payment actually made pursuant to
          the Subsidiary Guaranteed Obligations exceeds the limitation of the first
          sentence of this subsection (b) and is otherwise subject to avoidance and
          recovery in any such proceeding under Applicable Insolvency Laws, the amount
          subject to avoidance shall in all events be limited to the amount by which such
          actual payment exceeds such limitation and the Subsidiary Guaranteed
Obligations           as limited by the first sentence of this subsection (b) shall in
all events           remain in full force and effect and be fully enforceable against
such Guarantor.           The first sentence of this subsection (b) is intended solely to
preserve the           rights of the Administrative Agent hereunder against such
Guarantor in such           proceeding to the maximum extent permitted by Applicable
Insolvency Laws and           neither such Guarantor, the Borrower, any other Guarantor
nor any other Person           shall have any right or claim under such sentence that
would not otherwise be           available under Applicable Insolvency Laws in such
proceeding.  

        (c)       Agreements
for Contribution.  

            (i)                 To
the extent any Guarantor is required, by reason of its obligations hereunder,
          to pay to any Lender an amount greater than the amount of value (as determined
          in accordance with Applicable Insolvency Laws) actually made available to or
for           the benefit of such Guarantor on account of the Credit Agreement, this
Guaranty           or any other Loan Document, such Guarantor shall have an enforceable
right of           contribution against Holdings, the Borrower and the remaining
Guarantors, and           Holdings, the Borrower and the remaining Guarantors shall be
jointly and           severally liable, for repayment of the full amount of such excess
payment.           Subject only to the subordination provided in the following clause
(iv), such           Guarantor further shall be subrogated to any and all rights of the
Lenders           against Holdings, the Borrower and the remaining Guarantors to the
extent of           such excess payment.  

            (ii)                 To
the extent that any Guarantor would, but for the operation of this           subsection (c)
and by reason of its obligations hereunder or its           obligations to other
Guarantors under this subsection (c), be rendered           insolvent for any
purpose under Applicable Insolvency Laws, each of the           Guarantors hereby agrees
to indemnify such Guarantor and commits to make a           contribution to such Guarantor’s
capital in an amount at least equal to the           amount necessary to prevent such
Guarantor from having been rendered insolvent           by reason of the incurrence of
any such obligations.  

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            (iii)                 To
the extent that any Guarantor would, but for the operation of this           subsection (c)
be rendered insolvent under any Applicable Insolvency Law by           reason of its
incurring of obligations to any other Guarantor under the           foregoing clauses (i)
and (ii) above, such Guarantor shall, in turn have rights           of contribution and
indemnity, to the full extent provided in the foregoing           clauses (i) and (ii)
above, against Holdings, the Borrower and the remaining           Guarantors, such that
all obligations of all of the Guarantors hereunder and           under this subsection (c)
shall be allocated in a manner such that no           Guarantor shall be rendered
insolvent for any purpose under Applicable           Insolvency Law by reason of its
incurrence of such obligations.  

            (iv)                 Notwithstanding
any payment or payments by any of the Guarantors hereunder, or           any set-off or
application of funds of any of the Guarantors by the           Administrative Agent or
any Lender, or the receipt of any amounts by the           Administrative Agent or any
Lender with respect to any of the Subsidiary           Guaranteed Obligations, none of
the Guarantors shall be entitled to be           subrogated to any of the rights of the
Administrative Agent or any Lender           against Holdings, the Borrower or the other
Guarantors or any other guarantors           or against any collateral security held by
the Administrative Agent or any           Lender for the payment of the Subsidiary
Guaranteed Obligations nor shall any of           the Guarantors seek any reimbursement
from Holdings, the Borrower or any of the           other Guarantors in respect of
payments made by such Guarantor in connection           with the Subsidiary Guaranteed
Obligations, until all amounts owing to the           Administrative Agent and the
Lenders on account of the Subsidiary Guaranteed           Obligations (other than
contingent indemnity obligations) are paid in full and           the Commitments are
terminated. If any amount shall be paid to any Guarantor on           account of such
subrogation rights at any time when all of the Subsidiary           Guaranteed
Obligations shall not have been paid in full, such amount shall be           held by such
Guarantor in trust for the Administrative Agent, segregated from           other funds of
such Guarantor, and shall, forthwith upon receipt by such           Guarantor, be turned
over to the Administrative Agent in the exact form received           by such Guarantor
(duly endorsed by such Guarantor to the Administrative Agent,           if required) to
be applied against the Subsidiary Guaranteed Obligations,           whether matured or
unmatured, in such order as set forth in the Credit           Agreement.  

        2.02    
Nature of Guaranty. 

        (a)                 Each
Guarantor agrees that this Guaranty is a continuing, unconditional guaranty           of
payment and performance and not of collection, and that its obligations under
          this Guaranty shall be primary, absolute and unconditional, irrespective of,
and           unaffected by:  

	 	        (i)                      the
genuineness, validity, regularity, enforceability or any future amendment
               of, or change in, the Credit Agreement or any other Loan Document or any
other                agreement, document or instrument to which Holdings, the Borrower,
any                Subsidiary thereof or any Affiliate thereof is or may become a party;  

	 	        (ii)                      the
absence of any action to enforce this Guaranty, the Credit Agreement or any
               other Loan Document or the waiver or consent by the Administrative Agent
or any                Lender with respect to any of the provisions of this Guaranty, the
Credit                Agreement or any other Loan Document;  

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	 	        (iii)                      the
existence, value or condition of, or failure to perfect its Lien against,
               any security for or other guaranty of the Subsidiary Guaranteed
Obligations or                any action, or the absence of any action, by the
Administrative Agent or any                Lender in respect of such security or guaranty
(including, without limitation,                the release of any such security or
guaranty);  

	 	        (iv)                      any
structural change in, restructuring of or other similar change of Holdings,
               the Borrower or any of their Subsidiaries; or  

	 	        (v)                      any
other action or circumstances which might otherwise constitute a legal or
               equitable discharge or defense of a surety or guarantor;  

it being agreed by each Guarantor
that, subject to the first sentence in Section 2.01(b) hereof, its obligations
under this Guaranty shall not be discharged until the final indefeasible payment and
performance, in full, of the Subsidiary Guaranteed Obligations (other than contingent
indemnity obligations) and the termination of the Commitments. 

        (b)                 Each
Guarantor represents, warrants and agrees that its obligations under this
          Guaranty are not and shall not be subject to any counterclaims, offsets or
          defenses of any kind against the Administrative Agent, the Lenders or the
          Borrower whether now existing or which may arise in the future.  

        (c)                 Each
Guarantor hereby agrees and acknowledges that the Subsidiary Guaranteed
          Obligations, and any of them, shall conclusively be deemed to have been
created,           contracted or incurred, or renewed, extended, amended or waived, in
reliance           upon this Guaranty, and all dealings between Holdings, the Borrower
and any of           the Guarantors, on the one hand, and the Administrative Agent and
the Lenders,           on the other hand, likewise shall be conclusively presumed to have
been had or           consummated in reliance upon this Guaranty.  

        2.03    
Waivers. To the extent permitted by law, each Guarantor expressly waives all of the
following rights and defenses (and agrees not to take advantage of or assert any such
right or defense): 

        (a)                 rights
it may now or in the future have under any statute, or at law or in           equity, or
otherwise, to compel the Administrative Agent or any Lender to           proceed in
respect of the Subsidiary Guaranteed Obligations against the Borrower           or any
other Person or against any security for or other guaranty of the payment           and
performance of the Subsidiary Guaranteed Obligations before proceeding           against,
or as a condition to proceeding against, such Guarantor;  

        (b)                 any
defense based upon the failure of the Administrative Agent or any Lender to
          commence an action in respect of the Subsidiary Guaranteed Obligations against
          Holdings, the Borrower, such Guarantor, any other guarantor or any other Person
          or any security for the payment and performance of the Subsidiary Guaranteed
          Obligations;  

        (c)                 any
right to insist upon, plead or in any manner whatever claim or take the           benefit
or advantage of, any appraisal, valuation, stay, extension, marshalling           of
assets or redemption laws, or exemption, whether now or at any time hereafter
          in force, which may delay, prevent or otherwise affect the performance by such
          Guarantor of its obligations under, or the enforcement by the Administrative
          Agent or the Lenders of, this Guaranty;  

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        (d)                 any
right of diligence, presentment, demand, protest and notice (except as
          specifically required herein) of whatever kind or nature with respect to any of
          the Subsidiary Guaranteed Obligations and waives, to the extent permitted by
          law, the benefit of all provisions of law which are or might be in conflict
with           the terms of this Guaranty; and  

        (e)                 any
and all right to notice of the creation, renewal, extension or accrual of           any
of the Subsidiary Guaranteed Obligations and notice of or proof of reliance           by
the Administrative Agent or any Lender upon, or acceptance of, this Guaranty.  

Each Guarantor agrees that any notice
or directive given at any time to the Administrative Agent or any Lender which is
inconsistent with any of the foregoing waivers shall be null and void and may be ignored
by the Administrative Agent or such Lender, and, in addition, may not be pleaded or
introduced as evidence in any litigation relating to this Guaranty for the reason that
such pleading or introduction would be at variance with the written terms of this
Guaranty, unless the Administrative Agent and the Required Lenders have specifically
agreed otherwise in writing. The foregoing waivers are of the essence of the transaction
contemplated by the Credit Agreement and the other Loan Documents and, but for this
Guaranty and such waivers, the Administrative Agent and Lenders would decline to enter
into the Credit Agreement and the other Loan Documents. 

        2.04    
Modification of Loan Documents etc. Neither the Administrative Agent nor any Lender
shall incur any liability to any Guarantor as a result of any of the following, and none
of the following shall impair or release this Guaranty or any of the obligations of any
Guarantor under this Guaranty: 

        (a)                 any
change or extension of the manner, place or terms of payment of, or renewal           or
alteration of all or any portion of, the Subsidiary Guaranteed Obligations;  

        (b)                 any
action under or in respect of the Credit Agreement or the other Loan           Documents
in the exercise of any remedy, power or privilege contained therein or
          available to any of them at law, in equity or otherwise, or waiver or refrain
          from exercising any such remedies, powers or privileges;  

        (c)                 any
amendment or modification, in any manner whatsoever, of the Credit Agreement           or
the other Loan Documents;  

        (d)                 any
extension or waiver of the time for performance by any Guarantor, the           Borrower,
Holdings or any other Person of, or compliance with, any term,           covenant or
agreement on its part to be performed or observed under the Credit           Agreement or
any other Loan Document, or waiver of such performance or           compliance or consent
to a failure of, or departure from, such performance or           compliance;  

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        (e)                 any
taking and holding security or collateral for the payment of the Subsidiary
          Guaranteed Obligations or any sale, exchange, release, disposal of, or other
          dealing with, any property pledged, mortgaged or conveyed, or in which the
          Administrative Agent or any Lender have been granted a Lien, to secure any
          Indebtedness of any Guarantor, the Borrower, Holdings or any other Person to
the           Administrative Agent or the Lenders;  

        (f)                 any
release of anyone who may be liable in any manner for the payment of any
          amounts owed by any Guarantor, the Borrower, Holdings or any other Person to
the           Administrative Agent or any Lender;  

        (g)                 any
modification or termination of the terms of any intercreditor or           subordination
agreement pursuant to which claims of other creditors of any           Guarantor, the
Borrower, Holdings or any other Person are subordinated to the           claims of the
Administrative Agent or any Lender; or  

        (h)                 any
application of any sums by whomever paid or however realized to any amounts
          owing by any Guarantor, the Borrower, Holdings or any other Person to the
          Administrative Agent or any Lender on account of the Guaranteed Obligations in
          such manner as the Administrative Agent or any Lender shall determine in its
          reasonable discretion.  

        2.05    
Demand by the Administrative Agent. In addition to the terms set forth in this
Article II, and in no manner imposing any limitation on such terms, if all or any
portion of the then outstanding Subsidiary Guaranteed Obligations under the Credit
Agreement are declared to be immediately due and payable, then the Guarantors shall, upon
demand in writing therefor by the Administrative Agent to the Guarantors, pay all or such
portion of the outstanding Subsidiary Guaranteed Obligations then declared due and
payable. Notwithstanding the foregoing, each Guarantor agrees that, in the event of the
dissolution or insolvency of Holdings, the Borrower or any Guarantor, or the inability or
failure of Holdings, the Borrower or any Guarantor to pay debts as they become due, or an
assignment by Holdings, the Borrower or any Guarantor for the benefit of creditors, or the
commencement of any case or proceeding in respect of Holdings, the Borrower or any
Guarantor under bankruptcy, insolvency or similar laws, and if such event shall occur at a
time when any of the Subsidiary Guaranteed Obligations may not then be due and payable,
each Guarantor will pay to the Administrative Agent, for the ratable benefit of the
Lenders and their respective successors, indorsees, transferees and assigns, forthwith the
full amount which would be payable hereunder by each Guarantor if all such Subsidiary
Guaranteed Obligations were then due and payable. 

        2.06    
Remedies. Upon the occurrence and during the continuance of any Event of Default,
with the consent of the Required Lenders, the Administrative Agent may, or upon the
request of the Required Lenders, the Administrative Agent shall, enforce against the
Guarantors their respective obligations and liabilities hereunder and exercise such other
rights and remedies as may be available to the Administrative Agent hereunder, under the
Credit Agreement or the other Loan Documents or otherwise. 

        2.07    
Benefits of Guaranty. The provisions of this Guaranty are for the benefit of the
Administrative Agent and the Lenders and their respective permitted successors,
transferees, endorsees and assigns, and nothing herein contained shall impair, as between
the Borrower, the Administrative Agent and the Lenders, the obligations of the Borrower
under the Credit Agreement and the other Loan Documents. In the event all or any part of
the Subsidiary Guaranteed Obligations are transferred, endorsed or assigned by the
Administrative Agent or any Lender to any Person or Persons as permitted under the Credit
Agreement, any reference to an “Administrative Agent”, or “Lender”
herein shall be deemed to refer equally to such Person or Persons. 

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        2.08    
Termination; Reinstatement. 

        (a)                 Subject
to clause (c) below, this Guaranty shall remain in full force and effect           until
all the Subsidiary Guaranteed Obligations (other than contingent indemnity
          obligations) and all the obligations of the Guarantors shall have been paid in
          full and the Commitments terminated.  

        (b)                 No
payment made by Holdings, the Borrower, any Guarantor or any other Person
          received or collected by the Administrative Agent or any Lender from Holdings,
          the Borrower, any Guarantor or any other Person by virtue of any action or
          proceeding or any set-off or appropriation or application at any time or from
          time to time in reduction of or in payment of the Subsidiary Guaranteed
          Obligations shall be deemed to modify, reduce, release or otherwise affect the
          liability of any Guarantor hereunder which shall, notwithstanding any such
          payment (other than any payment made by such Guarantor in respect of the
          obligations of the Guarantors or any payment received or collected from such
          Guarantor in respect of the obligations of the Guarantors), remain liable for
          the obligations of the Guarantorsup to the maximum liability of such
          Guarantor hereunder until the Subsidiary Guaranteed Obligations (other than
          contingent indemnity obligations) and all the obligations of the Guarantorsshall
have been paid in full and the Commitments terminated.  

        (c)                 Each
Guarantor agrees that, if any payment made by Holdings, the Borrower or any
          other Person applied to the Obligations is at any time annulled, set aside,
          rescinded, invalidated, declared to be fraudulent or preferential or otherwise
          required to be refunded or repaid or the proceeds of any collateral are
required           to be refunded by the Administrative Agent or any Lender to the
Borrower, its           estate, trustee, receiver or any other Person, including, without
limitation,           Holdings or any Guarantor, under any applicable Law or equitable
cause, then, to           the extent of such payment or repayment, each Guarantor’s
liability           hereunder (and any Lien or collateral securing such liability) shall
be and           remain in full force and effect, as fully as if such payment had never
been           made, and, if prior thereto, this Guaranty shall have been canceled or
          surrendered (and if any Lien or collateral securing such Guarantor’s
          liability hereunder shall have been released or terminated by virtue of such
          cancellation or surrender), this Guaranty (and such Lien or collateral) shall
be           reinstated in full force and effect, and such prior cancellation or
surrender           shall not diminish, release, discharge, impair or otherwise affect
the           obligations of such Guarantor in respect of the amount of such payment (or
any           Lien or collateral securing such obligation).  

        2.09    Payments. Payments
by the Guarantors shall be made to the Administrative Agent, to be credited and applied
upon the Subsidiary Guaranteed Obligations, in immediately available Dollars to an
account designated by the Administrative Agent or at the Administrative Agent’s
Office or at any other address that may be specified in writing from time to time by the
Administrative Agent.  

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ARTICLE III 

REPRESENTATIONS AND
WARRANTIES 

        3.01    
Representations  and  Warranties.  To induce  the  Lenders to make any  Credit
 Extensions,  each Guarantor hereby represents and warrants that: 

	 	        (a)                      such
Guarantor has the corporate, limited liability company or other
               organizational right, power and authority to execute, deliver and perform
this                Guaranty and has taken all necessary corporate, limited liability
company or                other organizational action to authorize its execution,
delivery and performance                of, this Guaranty;  

	 	        (b)                      this
Guaranty constitutes the legal, valid and binding obligation of such
               Guarantor enforceable in accordance with its terms, except as
enforceability may                be limited by bankruptcy, insolvency, reorganization,
moratorium or similar laws                affecting the enforcement of creditors’ rights
generally and by the                availability of equitable remedies;  

	 	        (c)                      the
execution, delivery and performance of this Guaranty will not violate any
               applicable Law or Contractual Obligation of such Guarantor and will not
result                in the creation or imposition of any Lien upon or with respect to
any property                or revenues of such Guarantor (except in each case where to
the extent that such                violation could not reasonably be expected to have a
Material Adverse Effect);  

	 	        (d)                      no
consent or authorization of, filing with, or other act by or in respect of,
               any arbitrator or Governmental Authority and no consent of any other
Person is                required in connection with the execution, delivery,
performance, validity or                enforceability of this Guaranty;  

	 	        (e)                      no
actions, suits or proceedings before any arbitrator or Governmental Authority
               are pending or, to the knowledge of such Guarantor, threatened by or
against                such Guarantor or against any of its properties with respect to
this Guaranty or                any of the transactions contemplated hereby (other than
the existing proceeding                to terminate the Proxy Agreement);  

	 	        (f)                      such
Guarantor has such title to the real property owned by it and a valid
               leasehold interest in the real property leased by it, and has good and
               marketable title to all of its personal property sufficient to carry on
its                business free and clear of all Liens of any type whatsoever, except
for                Permitted Liens;  

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	 	        (g)                      as
of the Closing Date (or such later date upon which such Guarantor became a
               party hereto), such Guarantor (i) has capital sufficient to carry on its
               business and transactions and all business and transactions in which it
engages                and is able to pay its debts as they mature, (ii) owns property
having a value,                both at fair valuation on a going concern basis and a
present fair saleable                value on a going concern basis, greater than the
amount required to pay its                probable liabilities (including contingencies),
and (c) does not believe that it                will incur debts or liabilities beyond
its ability to pay such debts or                liabilities as they mature, subject in
each case to the first sentence in Section 2.01(b) hereof; and  

	 	        (h)                      such
Guarantor shall comply in all material respects with the provisions of Articles VII and
VIII of the Credit Agreement as if a party                thereto.  

ARTICLE IV 

MISCELLANEOUS 

        4.01    
Amendments in Writing. None of the terms or provisions of this Guaranty may be
waived, amended, supplemented or otherwise modified except in accordance with Section
12.01 of the Credit Agreement. 

        4.02    
Notices. All notices, requests and demands to or upon the Administrative Agent or
any Guarantor hereunder shall be made to the address of the Borrower and effected in the
manner provided for in Section 12.02 of the Credit Agreement. 

        4.03    
No Waiver by Course of Conduct, Cumulative Remedies. Neither the Administrative
Agent nor any Lender shall by any act (except by a written instrument pursuant to
Section 4.01), delay, indulgence, omission or otherwise be deemed to have
waived any right or remedy hereunder or to have acquiesced in any Default or Event of
Default. No failure to exercise, nor any delay in exercising on the part of the
Administrative Agent or any Lender, any right, power or privilege hereunder shall operate
as a waiver thereof. No single or partial exercise of any right, power or privilege
hereunder shall preclude any other or further exercise thereof or the exercise of any
other right, power or privilege. A waiver by the Administrative Agent or any Lender of any
right or remedy hereunder on any one occasion shall not be construed as a bar to any right
or remedy which the Administrative Agent or such Lender would otherwise have on any future
occasion. The rights and remedies herein provided are cumulative, may be exercised singly
or concurrently and are not exclusive of any other rights or remedies provided by law. 

        4.04    Enforcement
Expenses, Indemnification. 

        (a)                 Each
Guarantor agrees to pay or reimburse each Lender and the Administrative           Agent
for all its reasonable costs and expenses incurred in connection with           enforcing
or preserving any rights under this Guaranty and the other Loan           Documents to
which such Guarantor is a party, including, without limitation, the           reasonable
fees and disbursements of counsel to each Lender and of counsel to           the
Administrative Agent.  

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        (b)                 Each
Guarantor agrees to pay, and to save the Administrative Agent and the           Lenders
harmless from, any and all liabilities with respect to, or resulting           from any
delay in paying, any and all stamp, excise, sales or other non-income           taxes
which may be payable or determined to be payable with respect to any of           the
Collateral or in connection with any of the transactions contemplated by           this
Guaranty.  

        (c)                 Each
Guarantor agrees to pay, and to save the Administrative Agent and the           Lenders
harmless from any and all liabilities, obligations, losses, damages,           penalties,
costs and expenses in connection with actions, judgments, suits,           costs,
expenses or disbursements of any kind or nature whatsoever with respect           to the
execution, delivery, enforcement, performance and administration of this
          Guaranty to the extent the Borrower would be required to do so pursuant to Section
12.05 of the Credit Agreement.  

        (d)                 The
agreements in this Section 4.04 shall survive repayment of the
          Subsidiary Guaranteed Obligations and all other amounts payable under the
Credit           Agreement and the other Loan Documents.  

        4.05    
Governing Law; Consent to Jurisdiction. 

        (a)                 THIS
GUARANTY SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAW OF           THE
STATE OF NEW YORK APPLICABLE TO AGREEMENTS MADE AND TO BE PERFORMED ENTIRELY
          WITHIN SUCH STATE;PROVIDED THAT THE ADMINISTRATIVE AGENT AND EACH
          LENDER SHALL RETAIN ALL RIGHTS ARISING UNDER FEDERAL LAW.  

        (b)                 ANY
LEGAL ACTION OR PROCEEDING WITH RESPECT TO THIS GUARANTY OR ANY OTHER LOAN
          DOCUMENT MAY BE BROUGHT IN THE COURTS OF THE STATE OF NEW YORK SITTING IN NEW
          YORK, NEW YORK OR OF THE UNITED STATES FOR THE SOUTHERN DISTRICT OF SUCH STATE,
          AND BY EXECUTION AND DELIVERY OF THIS GUARANTY, EACH GUARANTOR AND THE
          ADMINISTRATIVE AGENT CONSENTS, FOR ITSELF AND IN RESPECT OF ITS PROPERTY, TO
THE           NON-EXCLUSIVE JURISDICTION OF THOSE COURTS. EACH GUARANTOR AND THE
          ADMINISTRATIVE AGENT IRREVOCABLY WAIVES ANY OBJECTION, INCLUDING ANY OBJECTION
          TO THE LAYING OF VENUE OR BASED ON THE GROUNDS OF FORUM NON CONVENIENS,
          WHICH IT MAY NOW OR HEREAFTER HAVE TO THE BRINGING OF ANY ACTION OR PROCEEDING
          IN SUCH JURISDICTION IN RESPECT OF THIS GUARANTY OR ANY OTHER LOAN DOCUMENT OR
          OTHER DOCUMENT RELATED THERETO. EACH GUARANTOR AND THE ADMINISTRATIVE AGENT
          WAIVES PERSONAL SERVICE OF ANY SUMMONS, COMPLAINT OR OTHER PROCESS, WHICH MAY
BE           MADE BY ANY OTHER MEANS PERMITTED BY THE LAW OF SUCH STATE.  

11 

        4.06    
Waiver of Jury Trial. EACH PARTY TO THIS GUARANTY HEREBY EXPRESSLY WAIVES ANY RIGHT
TO TRIAL BY JURY OF ANY CLAIM, DEMAND, ACTION OR CAUSE OF ACTION ARISING UNDER THIS
GUARANTY OR ANY OTHER LOAN DOCUMENT OR IN ANY WAY CONNECTED WITH OR RELATED OR INCIDENTAL
TO THE DEALINGS OF THE PARTIES HERETO OR ANY OF THEM WITH RESPECT TO THIS GUARANTY OR ANY
OTHER LOAN DOCUMENT, OR THE TRANSACTIONS RELATED THERETO, IN EACH CASE WHETHER NOW
EXISTING OR HEREAFTER ARISING, AND WHETHER FOUNDED IN CONTRACT OR TORT OR OTHERWISE; AND
EACH PARTY TO THIS GUARANTY HEREBY AGREES AND CONSENTS THAT ANY SUCH CLAIM, DEMAND, ACTION
OR CAUSE OF ACTION SHALL BE DECIDED BY COURT TRIAL WITHOUT A JURY, AND THAT ANY PARTY TO
THIS GUARANTY MAY FILE AN ORIGINAL COUNTERPART OR A COPY OF THIS SECTION WITH ANY COURT AS
WRITTEN EVIDENCE OF THE CONSENT OF THE SIGNATORIES HERETO TO THE WAIVER OF THEIR RIGHT TO
TRIAL BY JURY. 

        4.07    
Successors and Assigns. This Guaranty shall be binding upon the successors and
assigns of each Guarantor and shall inure to the benefit of each Guarantor (and shall bind
all Persons who become bound as a Guarantor under this Guaranty), the Administrative Agent
and the Lenders and their successors and assigns; provided that no Guarantor may
assign, transfer or delegate any of its rights or obligations under this Guaranty without
the prior written consent of the Administrative Agent (given in accordance with Section
4.01). 

        4.08    
Set-Off. Each Guarantor hereby irrevocably authorizes the Administrative Agent and
each Lender at any time and from time to time pursuant to Section 12.09 of the
Credit Agreement, without notice to such Guarantor or any other Guarantor, any such notice
being expressly waived by each Guarantor, to set-off and appropriate and apply any and all
deposits (general or special, time or demand, provisional or final), in any currency, and
any other credits, indebtedness or claims, in any currency, in each case whether direct or
indirect, absolute or contingent, matured or unmatured, at any time held or owing by the
Administrative Agent or such Lender to or for the credit or the account of such Guarantor,
or any part thereof in such amounts as the Administrative Agent or such Lender may elect,
against and on account of the obligations and liabilities of such Guarantor to the
Administrative Agent or such Lender hereunder and claims of every nature and description
of the Administrative Agent or such Lender against such Guarantor, in any currency,
whether arising hereunder, under the Credit Agreement, any other Loan Document or
otherwise, as the Administrative Agent or such Lender may elect, whether or not the
Administrative Agent or any Lender has made any demand for payment and although such
obligations, liabilities and claims may be contingent or unmatured. The Administrative
Agent and each Lender shall notify such Guarantor promptly of any such set-off and the
application made by the Administrative Agent or such Lender of the proceeds thereof;
provided that the failure to give such notice shall not affect the validity of such
set-off and application. The rights of the Administrative Agent and each Lender under this
Section 4.08 are in addition to other rights and remedies (including, without
limitation, other rights of set-off) which the Administrative Agent or such Lender may
have. 

        4.09    
Counterparts. This Guaranty may be executed by one or more of the parties to this
Guaranty on any number of separate counterparts (including by telecopy), and all of said
counterparts taken together shall be deemed to constitute one and the same instrument. 

12 

        4.10    
Severability. Any provision of this Guaranty or any other Loan Agreement which is
prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction, be
ineffective only to the extent of such prohibition or unenforceability without
invalidating the remainder of such provision or the remaining provisions hereof or thereof
or affecting the validity or enforceability of such provision in any other jurisdiction. 

        4.11    
Section Heading. The Section headings used in this Guaranty are for convenience of
reference only and are not to affect the construction hereof or be taken into
consideration in the interpretation hereof. 

        4.12    
Integration. This Guaranty and the other Loan Documents represent the agreement of
the Guarantors, the Administrative Agent and the Lenders with respect to the subject
matter hereof and thereof, and there are no promises, undertakings, representations or
warranties by the Administrative Agent or any Lender relative to subject matter hereof and
thereof not expressly set forth or referred to herein or in the other Loan Documents. 

        4.13    
    Acknowledgements.  Each Guarantor hereby acknowledges that: 

        (a)                 it
has been advised by counsel in the negotiation, execution and delivery of           this
Guaranty and the other Loan Documents to which it is a party;  

        (b)                 neither
the Administrative Agent nor any Lender has any fiduciary relationship           with or
duty to any Guarantor arising out of or in connection with this Guaranty           or any
of the other Loan Documents, and the relationship between the Guarantors,           on
the one hand, and the Administrative Agent and Lenders, on the other hand, in
          connection herewith or therewith is solely that of debtor and creditor; and  

        (c)                 no
joint venture is created hereby or by the other Loan Documents or otherwise
          exists by virtue of the transactions contemplated hereby among the Lenders or
          among the Guarantors and the Lenders.  

        4.14    
Powers Coupled with an Interest. All authorizations and agencies herein contained
are irrevocable and powers coupled with an interest. 

        4.15    
Additional Guarantors. Each Subsidiary of the Borrower that is required to become a
party to this Guaranty pursuant to Section 7.15 of the Credit Agreement shall
become a Guarantor for all purposes of this Guaranty upon execution and delivery by such
Subsidiary of a supplement in form and substance satisfactory to the Administrative Agent. 

        4.16    
Releases. At such time as the Subsidiary Guaranteed Obligations (other than
contingent indemnity obligations) shall have been paid in full and the Commitments have
been terminated, this Guaranty and all obligations (other than those expressly stated to
survive such termination) of the Administrative Agent and each Guarantor hereunder shall
terminate, all without delivery of any instrument or performance of any act by any party. 

[Signature Pages Follow] 

13 

        IN
WITNESS WHEREOF, each of the Guarantors has executed and delivered this Guaranty under
seal as of the date first above written. 

	[CORPORATE SEAL]	GETRONICS GOVERNMENT SOLUTIONS, L.L.C. (to be known as
		DIGITALNET
		GOVERNMENT SOLUTIONS, LLC)
	

 	By:  /s/                                                                               
		        Name: ________________________________
		        Title: _________________________________
	

[CORPORATE SEAL]	FEDERAL SYSTEMS INTEGRATION CORPORATION
	

 	By:  /s/                                                                               
		        Name: ________________________________
		        Title: _________________________________SUBSIDIARY GUARANTY
AGREEMENT SUPPLEMENT 

        SUBSIDIARY
GUARANTY AGREEMENT SUPPLEMENT, dated as of April 19, 2004 (the
“Supplement”), made by User Technology Associates, Inc., a Virginia
corporation (the “New Guarantor”), in favor of Bank of America, N.A., as
Administrative Agent (in such capacity, the “Administrative Agent”) under
the Credit Agreement (as defined in the Guaranty Agreement referred to below) for the
ratable benefit of itself and the Lenders (as defined in the Guaranty Agreement referred
to below). 

        Section
1.    Reference is hereby made to the Subsidiary Guaranty Agreement dated as of November
26, 2002 (as amended, restated supplemented or otherwise modified as of the date hereof,
the “Guaranty Agreement”), made by certain subsidiaries of DigitalNet
Holdings, Inc. (“Holdings”) and DigitalNet, Inc. (the
“Borrower”) party thereto on the Closing Date or otherwise joined as a
party thereto (such subsidiaries collectively, the “Guarantors”, and
each, a “Guarantor”), in favor of the Administrative Agent for the
benefit of itself and the Lenders. This Supplement supplements the Guaranty Agreement,
forms a part thereof and is subject to the terms thereof. Capitalized terms used and not
defined herein shall have the meanings given thereto or referenced in the Guaranty
Agreement. 

        Section
2.    The New Guarantor hereby agrees to unconditionally guarantee to the Administrative
Agent, for the ratable benefit of itself and the Lenders, and their respective successors,
endorsees, transferees and assigns, the prompt payment (whether at stated maturity, by
acceleration or otherwise) of all Obligations of the Borrower to the same extent and upon
the same terms and conditions as are contained in the Guaranty Agreement. 

        Section
3.    The New Guarantor hereby agrees that by executing this Supplement it is a party to
the Guaranty Agreement as if a signatory thereto on the Closing Date of the Credit
Agreement, and the New Guarantor shall comply with all of the terms, covenants, conditions
and agreements and hereby makes each representation and warranty, in each case set forth
therein. The New Guarantor agrees that the “Subsidiary Guaranty Agreement”,
“Guaranty Agreement” or “Guaranty” as used therein or in any other
Loan Documents shall mean the Guaranty Agreement as supplemented hereby. 

        Section
4.    The New Guarantor hereby acknowledges it has received a copy of the Guaranty
Agreement and that it has read and understands the terms thereof. 

[Signature Page
Follows] 

        IN
WITNESS WHEREOF, the undersigned hereby causes this Supplement to be executed and
delivered as of the date first above written. 

		USER TECHNOLOGY ASSOCIATES, INC.
	

 	By:  /s/ Ken S. Bajaj
		Name:  Ken S. Bajaj
		Title:  Chief Executive Officer and President

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