Exhibit 10.10 September 26, 2002 Ernst Volgenau 8302 Summerwood Drive McLean, VA 22102 Re: Amendment to Second Amended and Restated Stock Purchase Agreement Dear Dr. Volgenau: The purpose of this letter agreement is to amend the Second Amended and Restated Stock Purchase Agreement, dated as of May 29, 2002, between you and SRA International, Inc. (the "Stock Purchase Agreement"). As both parties to the Stock Purchase Agreement have agreed to terminate the two insurance policies on your life provided by Lincoln Benefit Life Company and to reduce the face amount of the policy provided by Transamerica Occidental Life Insurance Company from $55,500,000 to $10,000,000, Exhibit A to the Stock Purchase Agreement is hereby deleted and replaced in its entirety with the Exhibit A attached to this letter. Except as expressly modified hereby, all terms and conditions of the Stock Purchase Agreement are to remain in full force and effect. Sincerely, SRA INTERNATIONAL, INC. By: /s/ WILLIAM K. BREHM -------------------------------- William K. Brehm, Chairman of the Board of Directors Agreed and Accepted: /s/ ERNST VOLGENAU - ---------------------- Ernst Volgenau Date: September 26, 2002 ------------------ Exhibit A Summary of Insurance Policy on the Life of Ernst Volgenau Keyman Term Insurance Policy - SRA International, Inc. Sole Owner and Sole Beneficiary Insured Ernst Volgenau Owner SRA International, Inc. Beneficiary SRA International, Inc. Insurance Provider Transamerica Occidental Life Insurance Company Policy Number 41775236 Policy Term June 9, 2000 to June 9, 2010 Face Amount $ 10,000,000 Annual premium through June 2010 $ 53,200