Exhibit 10.1

EXECUTION COPY

LETTER AMENDMENT NO. 2

July 31, 2007

To the banks, financial institutions

and other institutional lenders

(collectively, the “Lenders”) parties

to the Credit Agreement referred to

below and to Citicorp USA, Inc., as agent

(the “Agent”) for the Lenders

Ladies and Gentlemen:

Reference is made to the Five Year Credit Agreement dated as of June 6, 2006, as
amended by the Letter Amendment dated as of August 23, 2006 (as so amended, the
“Credit Agreement”) among Science Applications International Corporation (the
“Company”), the banks and other financial institutions and the initial issuing
banks listed on the signature pages thereof, and Citicorp USA, Inc., as agent
(the “Agent”) for the Lenders. Capitalized terms used herein and not otherwise
defined shall have the meanings ascribed to such terms in the Credit Agreement.

The undersigned hereby requests that each of the Lenders agree to extend the
Maturity Date for one year, to June 6, 2012.

The Company hereby certifies that, as of the date hereof, the representations
and warranties contained in Section 4.01 of the Credit Agreement are correct and
no event has occurred and is continuing that constitutes a Default or an Event
of Default.

This Letter Amendment shall become effective as to each Lender that executes and
returns this Letter Amendment as of the date first above written when, and only
when, the Administrative Agent shall have received counterparts of this Letter
Amendment executed by the undersigned and the Requisite Lenders or, as to any of
the Lenders, advice satisfactory to the Administrative Agent that such Lender
has executed this Letter Amendment. This Letter Amendment is subject to the
provisions of Section 10.01 of the Credit Agreement.

On and after the effectiveness of this Letter Amendment, each reference in the
Credit Agreement to “this Agreement”, “hereunder”, “hereof” or words of like
import referring to the Credit Agreement, and each reference in the Notes and
each of the other Loan Documents to “the Credit Agreement”, “thereunder”,
“thereof” or words of like import referring to the Credit Agreement, shall mean
and be a reference to the Credit Agreement, as amended by this Letter Amendment.

The Credit Agreement, the Notes and each of the other Loan Documents, as
specifically amended by this Letter Amendment, are and shall continue to be in
full force and

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effect and are hereby in all respects ratified and confirmed. The execution,
delivery and effectiveness of this Letter Amendment shall not, except as
expressly provided herein, operate as a waiver of any right, power or remedy of
any Lender or the Administrative Agent under any of the Loan Documents, nor
constitute a waiver of any provision of any of the Loan Documents.

If you agree to the terms and provisions hereof, please evidence such agreement
by executing and returning at least two counterparts of this Letter Amendment to
Susan L. Hobart, Shearman & Sterling LLP, 599 Lexington Avenue, New York, New
York 10022.

This Letter Amendment may be executed in any number of counterparts and by
different parties hereto in separate counterparts, each of which when so
executed shall be deemed to be an original and all of which taken together shall
constitute one and the same agreement. Delivery of an executed counterpart of a
signature page to this Letter Amendment by telecopier shall be effective as
delivery of a manually executed counterpart of this Letter Amendment.

This Letter Amendment shall be governed by, and construed in accordance with,
the laws of the State of New York.

 

Very truly yours,

SCIENCE APPLICATIONS

INTERNATIONAL CORPORATION,

a Delaware corporation

By  

 

Title:  

SAIC, INC.,

a Delaware corporation

By  

 

Title:  

Agreed as of the date first above written:

 

CITICORP USA, INC.,

as Administrative Agent and as a Lender

By  

 

Title:   WACHOVIA BANK NATIONAL ASSOCIATION By  

 

Title:  

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BANK OF AMERICA, N.A.

By

 

 

Title:

 

MORGAN STANLEY BANK

By

 

 

Title:

 

U.S. BANK NATIONAL ASSOCIATION

By

 

 

Title:

 

THE BANK OF NEW YORK

By

 

 

Title:

 

KEYBANK NATIONAL ASSOCIATION

By

 

 

Title:

 

THE BANK OF NOVA SCOTIA

By

 

 

Title:

 

ROYAL BANK OF SCOTLAND PLC

By

 

 

Title:

 

SOCIETE GENERALE

By

 

 

Title: