Document:

<PAGE>

                                                                  EXHIBIT 10.31

                    PROFESSIONAL SERVICES AGREEMENT

          THIS PROFESSIONAL SERVICES AGREEMENT (this "AGREEMENT"), dated as
of September __, 2001, between GTCR Golder Rauner, L.L.C., a Delaware limited
liability company ("GTCR"), and DigitalNet, Inc., a Delaware corporation (the
"COMPANY").

          WHEREAS, the Company is a wholly owned subsidiary of DigitalNet
Holdings, Inc., a Delaware corporation (the "PARENT");

          WHEREAS, GTCR Fund VII, L.P., a Delaware limited partnership ("GTCR
FUND VII"), and GTCR Co-Invest, L.P., a Delaware limited partnership
("CO-INVEST") (each an "INVESTOR" and collectively, the "INVESTORS"), will
purchase (the "INVESTMENT") pursuant to that certain Purchase Agreement (the
"PURCHASE AGREEMENT") of even date herewith between the Parent, the
Investors, the J. Sunny Bajaj Trust, the Rueben Bajaj Trust and the Bajaj
Family Limited Partnership and Pearlstein Family, LLC, a portion of the
Company's Common Stock, par value $0.001 per share (the "COMMON STOCK"), and
Class A Preferred Stock, par value $0.01 per share (the "CLASS A PREFERRED"
and together with the Common Stock, the "STOCK");

          WHEREAS, the Company desires to receive financial and management
consulting services from GTCR, and obtain the benefit of the experience of
GTCR in business and financial management generally and its knowledge of the
Company and the Company's financial affairs in particular; and

          WHEREAS, in connection with the Investment, GTCR is willing to
provide financial and management consulting services to the Company and the
compensation arrangements set forth in this Agreement are designed to
compensate GTCR for such services.

          NOW, THEREFORE, in consideration of the foregoing premises and the
respective agreements hereinafter set forth and the mutual benefits to be
derived herefrom, GTCR and the Company hereby agree as follows:

          1. ENGAGEMENT. The Company hereby engages GTCR as a financial and
management consultant, and GTCR hereby agrees to provide financial and
management consulting services to the Company and its subsidiaries, all on
the terms and subject to the conditions set forth below.

          2. SERVICES OF GTCR. GTCR hereby agrees during the term of this
engagement to consult with the Company's board of directors (the "Board") and
management of the Company and its subsidiaries in such manner and on such
business and financial matters as may be reasonably requested from time to
time by the Board, including but not limited to:

          (i)     corporate strategy

          (ii)    budgeting of future corporate investments;

<PAGE>

          (iii)   acquisition and divestiture strategies; and

          (iv)    debt and equity financings.

          3. PERSONNEL. GTCR shall provide and devote to the performance of
this Agreement such partners, employees and agents of GTCR as GTCR shall deem
appropriate for the furnishing of the services required thereby.

          4. PLACEMENT FEES. At the time of any purchase of Stock by the
Investors pursuant to Section 1B of the Purchase Agreement or otherwise, the
Company shall pay to GTCR a placement fee in immediately available funds
equal to one percent (1.0%) of the amount paid by the Investors to the Parent
in connection with such purchase.

If any individual payment to GTCR pursuant to Section 4 would be less than
$10,000, then such payment shall be held by the Company until such time as
the aggregate of such payments equals or exceeds $10,000.

          5. MANAGEMENT FEE. Commencing on the date of the Initial Closing
(as defined in the Purchase Agreement) and until the date six months after
the date of the Initial Closing, the Company shall pay to GTCR an annual
management fee of $200,000 and thereafter during the remaining term of this
Agreement, the Company shall pay to GTCR an annual management fee of $300,000.
Such management fee shall be payable in equal monthly installments.

          6. EXPENSES. The Company shall promptly reimburse GTCR for such
reasonable travel expenses, legal fees and other out-of-pocket fees and
expenses as have been or may be incurred by GTCR, its directors, officers
and employees in connection with the Closing (as defined in the Purchase
Agreement), in connection with any financing of the Parent, the Company or
any of their subsidiaries, and in connection with the rendering of any other
services hereunder (including, but not limited to, fees and expenses incurred
in amending Company-related meetings).

          7. TERM. This Agreement will continue from the date of the Initial
Closing (as defined in the Purchase Agreement) until the earlier of (i) GTCR
Fund VII, Co-Invest and their respective affiliates ceasing to own in the
aggregate at least 50% of the Investor Common (as defined in the Purchase
Agreement) issued or transferred to such persons, (ii) a Sale of the Company
(as defined in the Purchase Agreement), or (iii) a Public Offering (as
defined in the Purchase Agreement). No termination of this Agreement, whether
pursuant to this paragraph or otherwise, shall affect the Company's
obligations with respect to the fees, costs and expenses incurred by GTCR in
rendering services hereunder and not reimbursed by the Company as of the
effective date of such termination.

          8. LIABILITY. Neither GTCR nor any of its affiliates, partners,
employees or agents shall be liable to the Parent, the Company or their
subsidiaries or affiliates for any loss, liability, damage or expense arising
out of or in connection with the performance of services contemplated by this
Agreement,

                                       2

<PAGE>

Unless such loss, liability, damage or expense shall be proven to result
directly from the gross negligence or willful misconduct of GTCR.

          9. INDEMNIFICATION. The Company agrees to indemnify and hold
harmless GTCR, its partners, affiliates, officers, agents and employees
against and from any and all loss, liability, suits, claims, costs, damages
and expenses (including attorney's fees) arising from their performance
hereunder, except as a result of their gross negligence or intentional
wrongdoing.

         10. GTCR AN INDEPENDENT CONTRACTOR. GTCR and the Company agree that
GTCR shall perform services hereunder as an independent contractor, retaining
control over and responsibility for its own operations and personnel. Neither
GTCR nor its directors, officers, or employees shall be considered employees or
agents of the Parent or any of its subsidiaries as a result of this Agreement
nor shall any of them have authority to contract in the name of or bind the
Parent or any of its subsidiaries, except as expressly agreed to in writing by
the Company.

         11. NOTICES. Any notice, report or payment required or permitted to be
given or made under this Agreement by one party to the other shall be deemed to
have been duly given or made if personally delivered or, if mailed, when mailed
by registered or certified mail, postage prepaid, to the other party at the
following addresses (or at such other address as shall be given in writing by
one party to the other):

         IF TO GTCR:
         ----------

                  GTCR Golder Rauner, L.L.C.
                  6100 Sears Tower
                  Chicago, IL 60606-6402
                  Attention: Philip A. Canfield

                  WITH A COPY TO:
                  --------------

                  Kirkland & Ellis
                  200 East Randolph Drive
                  Chicago, IL  60601
                  Attention: Stephen L. Ritchie

         IF TO THE COMPANY:
         -----------------

                  DigitalNet, Inc.
                  6700A Rockledge Drive, Suite 525
                  Bethesda, MD  20817
                  Attention: Ken S. Bajaj

                                       3

<Page>

                  WITH COPIES TO:
                  --------------

                  GTCR Golder Rauner, L.L.C.
                  6100 Sears Tower
                  Chicago, IL  60606-6402
                  Attention: Philip A. Canfield

                  Kirkland & Ellis
                  200 East Randolph Drive
                  Chicago, IL 60601
                  Attention: Stephen L. Ritchie

                  Fried, Frank, Harris, Shriver & Jacobson
                  1001 Pennsylvania Avenue
                  Washington, D.C. 20004
                  Attention: Richard A. Steinwurtzel

         12. ENTIRE AGREEMENT: MODIFICATION. This Agreement, those documents
expressly referred to herein and other documents of even date herewith embody
the complete agreement and understanding among the parties and supersede and
preempt any prior understandings, agreements or representations by or among the
parties, written or oral, which may have related to the subject matter hereof in
any way. The provisions of this Agreement may be amended, modified and waived
only with the prior written consent of the Company and GTCR.

         13. WAIVER OF BREACH. The waiver by either party of a breach of any
provision of this Agreement by the other party shall not operate or be construed
as a waiver of any subsequent breach of that provision or any other provision
hereof.

         14. ASSIGNMENT. Neither GTCR nor the Company may assign its rights
or obligations under this Agreement without the express written consent of the
other, except that GTCR may assign its rights and obligations to an affiliate of
GTCR.

         15. SUCCESSORS. This Agreement and all the obligations and benefits
hereunder shall inure to the successors and permitted assigns of the parties.

         16. COUNTERPARTS. This Agreement may be executed and delivered by each
party hereto in separate counterparts (including by means of telecopied
signature pages), each of which when so executed and delivered shall be deemed
an original and both of which taken together shall constitute one and the same
agreement.

         17. CHOICE OF LAW. This Agreement shall be governed by and construed in
accordance with the domestic laws of the State of Delaware, without giving
effect to any choice of law or conflict of law provision or rule (whether of the
State of Delaware or any other jurisdiction) that would cause the application of
the laws of any jurisdiction other than the State of Delaware.

                                   * * * * *

                                       4

<Page>

         IN WITNESS WHEREOF, GTCR and the Company have caused this
Professional Services Agreement to be duly executed and delivered on the date
and year first above written.

                                   GTCR GOLDER RAUNER, L.L.C.

                                   By:  /s/ BRUCE V. RAUNER
                                        -------------------------
                                   Name: BRUCE V. RAUNER
                                        -------------------------
                                   Its: Principal
                                        -------------------------

                                   DIGITALNET, INC.

                                   By:  /s/ KEN S. BAJAJ
                                        -------------------------
                                   Name: Ken S. Bajaj
                                        -------------------------
                                   Its: Chief Executive Officer
                                        -------------------------

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Exhibit 4.7    
  

233
South Wacker Drive, Suite 28

Chicago, Illinois 60606

Tel 312-234-2732

Fax 312-234-3603 

Bank of America, N. A.

	TO:	Eldorado Resorts LLC

c/o Eldorado Hotel and Casino

P 0 Box 3399

Reno, NV 89505
	

ATTN:	

Bob Jones
	

TEL:	

775-786-5700
	

FAX:	

775-343-7513
	

FROM:	

Bank of America, NA.

233 South Wacker Drive—Suite 2800

Chicago, Illinois 60606

Robert OHara/David Rebnord
	

Date: revised 12NOV02
	

 	

 

	

Our Reference No.	

3004937
	

Internal Tracking Nos.	

481653 481654
	

 	

 

The purpose of this letter agreement is to confirm the terms and conditions of the Transaction entered into between Eldorado Resorts LLC and Bank of America, N.A. (each a
"party" and together "the parties") on the Trade Date specified below (the "Transaction"). This letter agreement constitutes a "Confirmation" as referred to in the ISDA Master Agreement specified in
paragraph 1 below (the "Agreement"). 

The
definitions and provisions contained in the 2000 ISDA Definitions, as published by the International Swaps and Derivatives Association, Inc., (the "Definitions") are incorporated into this
Confirmation. In the event of any inconsistency between the Definitions and this Confirmation, this Confirmation will govern. 

1.    This
Confirmation supplements, forms part of, and is subject to, the ISDA Master Agreement dated as of 16JUL02, as amended and supplemented from time to time (the "Agreement"), between
the parties. All provisions contained in the Agreement govern this Confirmation except as expressly modified below. 

In
this Confirmation "Party A" means Bank of America, N.A. and "Party B" means Eldorado Resorts LLC. 

2.    The
terms of the particular Transaction to which this Confirmation relates are as follows: 

	

Notional Amount:	

USD 50,000,000.00
	

Trade Date:	

07NOV02
	

Effective Date:	

12NOV02
	

Termination Date:	

15AUG06, subject to adjustment in accordance with the Modified Following Business Day Convention and "Other Provisions".
	
Fixed Amounts:	

 
	

Fixed Rate Payer:	

Party A
	

Fixed Rate Payer

Payment Dates:	

The 15th of each February and August, commencing 15FEB03 and ending 15AUG06, subject to adjustment in accordance with the Modified Following Business Day Convention. No Adjustment Of Period End Dates.
	

Fixed Rate:	

3.44000%
	

Fixed Rate Day

Count Fraction:	

30/360
	
 	

 

	
Floating Amounts:	

 
	

Floating Rate Payer:	

Party B
	

Floating Rate Payer

Payment Dates:	

The 15th of each February and August, commencing 15FEB03 and ending 15AUG06, subject to adjustment accordance with the Modified Following Business Day Convention.
	
Floating Rate for initial Calculation Period:	

1.41000%
	

Floating Rate Option:	

USD-LIBOR-BBA
	

Averaging:	

Inapplicable
	

Designated Maturity:	

6 Month
	

Spread:	

None
	

Floating Rate Day

Count Fraction:	

Actual/360
	

Reset Dates:	

The last day of each Calculation Period
	

Compounding:	

Inapplicable
	

Business Days:	

New York, London
	

Calculation Agent:	

Party A
	

 	

 

Additional Optional Termination: 

Notwithstanding
anything to the contrary herein or in the Agreement or the Definitions, Party A may, in its sole discretion and at its expense, terminate this Transaction on any day from and including
15AUG03 to but excluding 15AUG06 (the "Optional Termination Date"), in accordance with this Additional Optional Termination provision. The cancellation premium owed by Party A with respect to such
Optional Termination Date is set forth under Section (i) below. Party A may only elect an Optional Termination Date by providing oral (including telephonic) notice of such election to Party B
two New York and London Business Days prior to such Optional Termination Date, on or before 4:30 p.m. New York City time. Party A shall provide written confirmation of any telephonic notice
within one New York and London Business Day of that notice. Failure to provide that written confirmation will not affect the validity of the telephonic notice. The Cash Settlement Amount payable by
Party A on the Optional Termination Date shall be calculated as the sum of the following: 

The
amount payable on the applicable Fixed Rate Payer Payment Date shall be calculated as the sum of the following: 

        (i)
The cancellation premium, in accordance with the Optional Termination Date schedule as set forth below: 

	Optional Termination Period
 
	 	Amount

	15AUG03 to but excluding 16AUG04	 	USD 875,000.00
	16AUG04 to but excluding 14AUG06	 	USD 0.00

        (ii)
the net of the accrued but unpaid amount between the Fixed Rate Payer and the Floating Rate Payer from and including the last Payment Date to but excluding the Optional Termination
Date. 

Nothing
herein shall obligate Party A to elect the Optional Termination Date as provided herein. 

Optional Early Termination:  

Notwithstanding
anything to the contrary in the Definitions or the Agreement, the parties hereby agree to the following Optional Early Termination provisions: 

For
purpose of this Optional Early Termination provision, Business Days shall mean New York and London Business Days. 

Either
party shall have the right (but not the obligation) to terminate this Transaction, effective as of 15FEB06 or if such day is not a Business Day, on the next succeeding Business Day (the
"Optional 

Early Termination Date"), by providing the other party with notice of its exercise of this right five Business Days prior to the Optional Early Termination Date. This notice shall be irrevocable and
may be given orally, including by telephone. Such notice shall be followed by a written confirmation confirming the substance of any telephonic notice within one Business Day of that notice. Failure
to provide that written confirmation will not affect the validity of the telephonic notice. 

In
the event either party elects to terminate this Transaction as provided above, the Calculation Agent shall determine the Cash Settlement Amount in good faith and in a commercially reasonable manner
in accordance with normal market practice in the relevant market. Such determination shall be made on the day that is two Business Days prior to the Optional Early Termination Date. In the absence of
manifest error, such determination shall be final and conclusive evidence of the Cash Settlement Amount payable in respect of such Optional Early Termination Date. Party A or Party B (as determined by
the Calculation Agent) shall pay to the other party the Cash Settlement Amount on the Optional Early Termination Date. Once the Cash Settlement Amount has been fully and finally paid, then all rights,
duties and obligations of the parties under and with respect to this Transaction shall terminate. 

3. Recording of Conversations:  

Each
party to this Transaction acknowledges and agrees to the tape recording of conversations between the parties to this Transaction whether by one or other or both of the parties or their agents,
and that any such tape recordings may be submitted in evidence in any Proceedings relating to the Agreement and/or this Transaction. 

4. Account Details:  

Account
for payments to Party A: 

	 	USD
	NAME:	Bank of America, NA.
	CITY:	New York
	ABA#:	026009593
	ATTN:	BOFAUS3N
	NAME	Bank of America, N A.
	CITY	Charlotte
	ACCT:	6550219386
	ATIN:	Rate Derivative Settlements
	ATTN:	BOFAUS6SGDS

Account for payments to Party B: 

Please
provide. 

5. Offices:  

	The Office of Party A for this

Transaction is:	Charlotte, NC

Please send reset notices to fax no. (312-234-3603) 

	The Office of Party B for this

Transaction is:	Nevada, USA

Credit Support Document: As per Agreement (and Credit Support Annex if applicable). 

Please
confirm that the foregoing correctly sets forth the terms and conditions of our agreement by returning via telecopier an executed copy of this Confirmation to the attention of Global Derivative
Operations at (fax no. (312) 234-3603). 

Yours
Sincerely, 

Bank
America, N.A. 

	/s/  DAVE WALKER      
 Dave Walker

Senior Vice President	 	 
	

Authorized Signatory	
 	

 
	

Accepted and confirmed as of the date first written:	
 	

 
	

Eldorado Resorts LLC	
 	

 
	

By:	

/s/  DONALD L. CARANO      
	
 	

 
	

Name:	

Donald L. Carano
	
 	

 
	

Title:	

CEO
	
 	

 
	

Our Reference # 3004937 481653	
 	

 
	

 	

 	
 	

 

QuickLinks

Exhibit 4.7

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