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                                                                    Exhibit 10.8

                            REVOLVING PROMISSORY NOTE

September 7, 2001                                                       $45,899

                  Jack Pearlstein ("MAKER"), hereby promises to pay to the order
of DigitalNet Holdings, Inc. (the "COMPANY"), the aggregate unpaid principal
amount of this Note, together with interest thereon calculated from the date
hereof in accordance with the provisions of this Note.

                  This Note is the promissory note referred to in the Senior
Management Agreement, dated as of September 7, 2001, by and among the Company,
DigitalNet, Inc., a Delaware corporation, and Maker (the "MANAGEMENT
AGREEMENT"). Sections 1(a)(i), 1(b)(ii) and 2(b) of the Management Agreement
contain provisions for the issuance of this Note and increases and decreases of
the principal amount hereunder upon the terms and conditions specified therein.
Capitalized terms used herein and not otherwise defined shall have the meanings
given to them in the Management Agreement.

                  1. BORROWINGS UNDER NOTE. The date and amount of all loans
made by the Company to the Maker hereunder, the date and amount of each payment
of principal, and the date and amount of each payment of interest shall be noted
by the Company on SCHEDULE I annexed hereto and made a part hereof, or on a
continuation of such schedule attached hereto and made a part hereof; PROVIDED,
HOWEVER, that the failure of the Company to make, or any error in making, any
such notation shall not limit, expand or otherwise affect the obligations of the
Maker hereunder or under the Management Agreement.

                  2. PAYMENT OF INTEREST. Interest shall accrue on the
outstanding principal amount of this Note at a rate equal to the lesser of (i)
5% per annum and (ii) the highest rate permitted by applicable law, compounded
annually. Accrued interest shall be payable at such time as the principal of
this Note becomes due and payable. The Company may note such interest on
SCHEDULE I annexed hereto provided that any failure to note such amount shall
not change the obligation of the Maker to pay such amount.

                  3. PAYMENT OF PRINCIPAL ON NOTE.

                  (a) TERM. Subject to Section 3(b) below, the entire principal
amount of this Note and all accrued interest thereon shall be due and payable on
September ___, 2010.

                  (b) MANDATORY PREPAYMENTS. Upon the earlier of (i) a Liquidity
Event or (ii) a Public Offering, Maker shall pay the entire principal amount
then outstanding and any accrued interest to the Company. In addition, in the
event Maker receives any net cash proceeds in connection with his ownership of
the Reserved Stock, Maker shall prepay any amounts owed

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pursuant to this Note by applying all of such proceeds FIRST, to any accrued
interest and SECOND, to any principal then outstanding.

                  (c) OPTIONAL PREPAYMENTS. Maker may, at any time and from time
to time without premium or penalty, prepay all of the outstanding principal
amount of the Note; provided that any prepayment will be accompanied by a
payment of accrued interest on the portion being prepaid. A prepayment of less
than all of the outstanding principal amount of the Note shall not relieve Maker
of his obligation to make the payments on the Note pursuant to Sections 3(a) and
3(b) above.

                  (d) RIGHT OF OFFSET. The Maker shall be entitled to offset any
amounts owed to the Maker by the Company, now existing or hereinafter arising,
pursuant to and as set forth in Section 2 of the Management Agreement between
the Company and the Maker, against any amounts payable under this Note.
Following an Event of Default, the Company shall be entitled to offset any
amounts owed to the Company by the Maker, now existing or hereinafter arising,
pursuant to this Note against any amounts payable by the Company to the Maker
pursuant to and as set forth in the Management Agreement between the Company and
the Maker.

                  4. SECURITY.

                  (a) PLEDGE. The amounts due under this Note are secured by a
pledge of shares of the Company's Common Stock under the terms of the Executive
Stock Pledge Agreement of even date herewith between Maker and the Company, and
the payment of the principal amount and accrued interest under this Note is
subject to certain offset rights under the Management Agreement.

                  (b) RECOURSE. Notwithstanding anything herein or in any other
agreement, instrument or other document to the contrary, the Maker shall be
personally liable for the repayment of the indebtedness evidenced by this Note
or for any claim of any kind based thereon or relating thereto to the extent of
the first 50% of the amount of the Note. For the remaining 50% of the amount of
the Note, the Lender shall be entitled to and shall look solely to the Pledged
Shares (as defined in the Executive Stock Pledge Agreement of even date herewith
between Maker and the Company) as its sole and exclusive remedy, including,
without limitation, any cash or non-cash proceeds therefrom, for the repayment
of the indebtedness evidenced by this Note and any other claim of any kind
relating thereto or to the Executive Stock Pledge Agreement or arising hereunder
or thereunder. The payment of the principal amount and accrued interest under
this Note is subject to certain offset rights as set forth in Section 3(d)
above.

                  5. EVENTS OF DEFAULT.

                  (a) DEFINITION. For purposes of this Note, an Event of Default
         shall be deemed to have occurred if:

                           (i) Maker fails to pay when due, the full amount of
         any principal or interest payment, and such amount remains unpaid for 2
         business days following receipt of written notice from the Company; or

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                           (ii) Maker makes an assignment for the benefit of
         creditors or admits in writing his inability to pay his debts generally
         as they become due; or an order, judgment or decree is entered
         adjudicating Maker bankrupt or insolvent; or any order for relief with
         respect to Maker is entered under the Federal Bankruptcy Code; or Maker
         petitions or applies to any tribunal for the appointment of a
         custodian, trustee, receiver or liquidator of any substantial part of
         Maker's assets, or commences any proceeding relating to Maker under any
         bankruptcy, reorganization, arrangement, insolvency, readjustment of
         debt, dissolution or liquidation law of any jurisdiction; or any such
         petition or application is filed, or any such proceeding is commenced,
         against Maker and either (A) Maker by any act indicates its approval
         thereof, consent thereto or acquiescence therein or (B) such petition,
         application or proceeding is not dismissed within 60 days.

                  (b) CONSEQUENCES OF EVENTS OF DEFAULT. If an Event of Default
has occurred the aggregate principal amount of the Note (together with all
accrued interest thereon and all other amounts payable in connection therewith)
shall become immediately due and payable without any action on the part of the
Company, and Maker shall immediately pay to the Company all amounts due and
payable with respect to the Note.

                  Maker, or his successors and assigns, hereby waives diligence,
presentment, protest and demand and notice of protest and demand, dishonor and
nonpayment of this Note, and expressly agrees that this Note, or any payment
hereunder, may be extended from time to time and that the Company may accept
security for this Note or release security for this Note, all without in any way
affecting the liability of Maker hereunder.

                  In the event that Maker fails to pay any amounts due hereunder
when due, Maker shall pay to the Company, in addition to such amounts due, all
costs of collection, including, without limitation, reasonable attorneys fees.

                  6. AMENDMENT AND WAIVER. Except as otherwise expressly
provided herein, the provisions of the Note may be amended and Maker may take
any action herein prohibited, or omit to perform any act herein required to be
performed by it, only if Maker has obtained the written consent of the Company.

                  7. CANCELLATION. After all principal and accrued interest at
any time owed on this Note has been paid in full, this Note shall be surrendered
to Maker for cancellation and shall not be reissued.

                  8. PLACE OF PAYMENT. Payments of principal and interest are to
be delivered to the Company at the following address:

                           DigitalNet Holdings, Inc.
                           6700A Rockledge Drive, Suite 525
                           Bethesda, MD 20817
                           Attention:  President and Chief Executive Officer

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or to such other address or to the attention of such other person as specified
by prior written notice to Maker.

                  9. USURY LAWS. It is the intention of the Company and Maker to
conform strictly to all applicable usury laws now or hereafter in force, and any
interest payable under this Note shall be subject to reduction to the amount not
in excess of the maximum legal amount allowed under the applicable usury laws as
now or hereafter construed by the courts having jurisdiction over such matters.
If the maturity of this Note is accelerated by reason of an election by the
Company resulting from an Event of Default, voluntary prepayment by Maker or
otherwise, then earned interest may never include more than the maximum amount
permitted by law, computed from the date hereof until payment, and any interest
in excess of the maximum amount permitted by law shall be canceled automatically
and, if theretofore paid, shall at the option of the Company either be rebated
to Maker or credited on the principal amount of this Note, or if this Note has
been paid, then the excess shall be rebated to Maker. The aggregate of all
interest (whether designated as interest, service charges, points or otherwise)
contracted for, chargeable, or receivable under this Note shall under no
circumstances exceed the maximum legal rate upon the unpaid principal balance of
this Note remaining unpaid from time to time. If such interest does exceed the
maximum legal rate, it shall be deemed a mistake and such excess shall be
canceled automatically and, if theretofore paid, rebated to Maker or credited on
the principal amount of this Note, or if this Note has been repaid, then such
excess shall be rebated to Maker.

                  10. GOVERNING LAW. This Note is made under and governed by the
internal law, not the laws of conflicts, of the State of Delaware.

                                    * * * * *

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                  IN WITNESS WHEREOF, Maker has executed and delivered this Note
as of the date above.

                                                     /s/ JACK PEARLSTEIN
                                                     ---------------------------
                                                     JACK PEARLSTEIN

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                                                                    Exhibit 10.9

                        EXECUTIVE STOCK PLEDGE AGREEMENT

                  THIS EXECUTIVE STOCK PLEDGE AGREEMENT (this "PLEDGE
AGREEMENT") is made as of September 7, 2001 between Jack Pearlstein
("PLEDGOR") and DigitalNet Holdings, Inc. (the "COMPANY").

                  The Company and Pledgor are parties to a Senior Management
Agreement, dated as of September 7, 2001 (the "SENIOR MANAGEMENT AGREEMENT"),
pursuant to which Pledgor will purchase up to 1,577,784 shares of the Company's
Common Stock, $0.001par value per share (the "RESERVED SHARES"), for an
aggregate purchase price of up to $155,778. The aggregate number of Reserved
Shares will be purchased over time by Pledgor in accordance with Sections
1(a)(i) and 1(b)(ii) of the Senior Management Agreement (a "RESERVED SHARE
PURCHASE"). The Company has allowed Pledgor to purchase a portion of the
Reserved Shares by delivery to the Company of a revolving promissory note (the
"NOTE"). As set forth in Section 2 of the Senior Management Agreement, from time
to time the Company may repurchase all or a portion of the Reserved Shares ( a
"RESERVED SHARE REPURCHASE"), which shall reduce the number of Reserved Shares
held by the Pledgor. The number of Reserved Shares held at any time by the
Pledgor (as adjusted for Reserved Share Purchases and Reserved Share
Repurchases) shall be defined as the "PLEDGED SHARES." This Pledge Agreement
provides the terms and conditions upon which the Note is secured by a pledge to
the Company of the Pledged Shares.

                  NOW, THEREFORE, in consideration of the premises contained
herein and other good and valuable consideration the receipt and sufficiency of
which are hereby acknowledged, and in order to induce the Company to accept the
Note as partial payment for the Pledged Shares, Pledgor and the Company hereby
agree as follows:

                  1. PLEDGE. Pledgor hereby pledges to the Company, and grants
to the Company a security interest in, the Pledged Shares as security for the
prompt and complete payment when due of the unpaid principal of and interest on
the Note and full payment and performance of the obligations and liabilities of
Pledgor hereunder.

                  2. DELIVERY OF PLEDGED SHARES. Upon the execution of this
Pledge Agreement and upon any Reserved Share Purchase, Pledgor shall deliver to
the Company the certificate(s) representing the Pledged Shares, together with
duly executed forms of assignment sufficient to transfer title thereto to the
Company.

                  3. VOTING RIGHTS; CASH DIVIDENDS. Notwithstanding anything to
the contrary contained herein, during the term of this Pledge Agreement until
such time as there exists a default in the payment of principal or interest on
the Note or any other default under the Note or hereunder, Pledgor shall be
entitled to all voting rights with respect to the Pledged Shares and shall be
entitled to receive all cash dividends paid in respect of the Pledged Shares.
Upon the occurrence of and during the continuance of any such default, Pledgor
shall no longer be able to

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vote the Pledged Shares and the Company shall apply all such cash dividends
payable on the Pledged Shares against any unpaid portion of the Note.

                  4. STOCK DIVIDENDS; DISTRIBUTIONS, ETC. If, while this Pledge
Agreement is in effect, Pledgor becomes entitled to receive or receives any
securities or other property in addition to, in substitution of, or in exchange
for any of the Pledged Shares (whether as a distribution in connection with any
recapitalization, reorganization or reclassification, a stock dividend or
otherwise), Pledgor shall accept such securities or other property on behalf of
and for the benefit of the Company as additional security for Pledgor's
obligations under the Note and shall promptly deliver such additional security
to the Company together with duly executed forms of assignment, and such
additional security shall be deemed to be part of the Pledged Shares hereunder.

                  5. DEFAULT. If Pledgor defaults in the payment of the
principal or interest under the Note when it becomes due (whether upon demand,
acceleration or otherwise) or any other event of default under the Note or this
Pledge Agreement occurs (including, without limitation, the bankruptcy or
insolvency of Pledgor), the Company may exercise any and all the rights, powers
and remedies of any owner of the Pledged Shares (including, without limitation,
the right to vote the shares and receive dividends and distributions with
respect to such shares) and shall have and may exercise without demand any and
all the rights and remedies granted to a secured party upon default under the
Uniform Commercial Code of Delaware or otherwise available to the Company under
applicable law. Without limiting the foregoing, the Company is authorized to
sell, assign and deliver at its discretion, from time to time, all or any part
of the Pledged Shares at any private sale or public auction, on not less than
ten days written notice to Pledgor, at such price or prices and upon such terms
as the Company may deem advisable. Pledgor shall have no right to redeem the
Pledged Shares after any such sale or assignment. At any such sale or auction,
the Company may bid for, and become the purchaser of, the whole or any part of
the Pledged Shares offered for sale. In case of any such sale, after deducting
the costs, attorneys' fees and other expenses of sale and delivery, the
remaining proceeds of such sale shall be applied to the principal of and accrued
interest on the Note; provided that after payment in full of the indebtedness
evidenced by the Note, the balance of the proceeds of sale then remaining shall
be paid to Pledgor and Pledgor shall be entitled to the return of any of the
Pledged Shares remaining in the hands of the Company. Pledgor shall be liable
for any deficiency if the remaining proceeds are insufficient to pay the
indebtedness under the Note in full, including, without limitation, the fees of
any attorneys employed by the Company to collect such deficiency.

                  6. COSTS AND ATTORNEYS' FEES. All reasonable costs and
expenses (including, without limitation, attorneys' fees) incurred in exercising
any right, power or remedy conferred by this Pledge Agreement or in the
enforcement thereof, shall become part of the indebtedness secured hereunder and
shall be paid by Pledgor or repaid from the proceeds of the sale of the Pledged
Shares hereunder.

                  7. PAYMENT OF INDEBTEDNESS AND RELEASE OF PLEDGED SHARES. Upon
payment in full of the indebtedness evidenced by the Note, the Company shall
surrender all of the Pledged Shares (and any dividends held as security) to
Pledgor together with all forms of assignment.

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Upon a Reserved Share Repurchase, the Company shall surrender to the purchaser
of the Reserved Shares (upon receipt of payment therefor) the number of Reserved
Shares being repurchased together with all forms of assignment.

                  8. NO OTHER LIENS; NO SALES OR TRANSFERS. Pledgor hereby
represents and warrants that he has good and valid title to all of the Pledged
Shares, free and clear of all liens, security interests and other encumbrances,
other than pursuant to the Senior Management Agreement and a Stockholders
Agreement dated as of September 7, 2001 among the Company and certain of its
stockholders (including, without limitation, Pledgor), and Pledgor hereby
covenants that, until such time as all of the outstanding principal of and
interest on the Note has been repaid, Pledgor shall not (i) create, incur,
assume or suffer to exist any pledge, security interest, encumbrance, lien or
charge of any kind against the Pledged Shares or Pledgor's rights or a holder
thereof, other than pursuant to this Agreement, or (ii) sell or otherwise
transfer any Pledged Shares or any interest therein.

                  9. FURTHER ASSURANCES. Pledgor agrees that at any time and
from time to time upon the written request of the Company, Pledgor shall execute
and deliver such further documents (including UCC financing statements) and do
such further acts and things as the Company may reasonably request in order to
effect the purposes of this Pledge Agreement.

                  10. SEVERABILITY. Any provision of this Pledge Agreement which
is prohibited or unenforceable in any jurisdiction shall, as to such
jurisdiction, be ineffective to the extent of such prohibition or
unenforceability without invalidating the remaining provisions hereof, and any
such prohibition or unenforceability in any jurisdiction shall not invalidate or
render unenforceable such provision in any other jurisdiction.

                  11. NO WAIVER; CUMULATIVE REMEDIES. The Company shall not by
any act, delay, omission or otherwise be deemed to have waived any of its rights
or remedies hereunder, and no waiver shall be valid unless in writing, signed by
the Company, and then only to the extent therein set forth. A waiver by the
Company of any right or remedy hereunder on any one occasion shall not be
construed as a bar to any right or remedy which the Company would otherwise have
on any future occasion. No failure to exercise nor any delay in exercising on
the part of the Company, any right, power or privilege hereunder shall preclude
any other or further exercise thereof or the exercise of any other right, power
or privilege. The rights and remedies herein provided are cumulative and may be
exercised singly or concurrently, and are not exclusive of any rights or
remedies provided by law.

                  12. WAIVERS, AMENDMENTS; APPLICABLE LAW. None of the terms or
provisions of this Pledge Agreement may be waived, altered, modified or amended
except by an instrument in writing, duly executed by the parties hereto. This
Agreement and all obligations of the Pledgor hereunder shall together with the
rights and remedies of the Company hereunder, inure to the benefit of the
Company and its successors and assigns. This Pledge Agreement shall be governed
by, and be construed and interpreted in accordance with, the laws of the State
of Delaware.

                                    * * * * *

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                  IN WITNESS WHEREOF, this Pledge Agreement has been executed as
of the date first above written.

                                         DIGITALNET HOLDINGS, INC.

                                         By: /s/ KEN S. BAJAJ
                                             ----------------------------------

                                         Name: KEN S. BAJAJ
                                               --------------------------------

                                         Its: CHIEF EXECUTIVE OFFICER
                                              ----------------------------------

                                         /s/ Jack Pearlstein
                                         ---------------------------------------
                                         JACK PEARLSTEIN

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