United States Deputy Secretary of Defense

, April 2, 1949, originally established this position as the under secretary of defense, however August 10, 1949, a.k.a. the 1949 Amendments to the National Security Act of 1947, changed the title to deputy secretary of defense. Former assistant to President Franklin D. Roosevelt, Stephen Early, became the first officer holder when he was sworn in on May 2, 1949. , October 27, 1972, established a second deputy secretary of defense position, with both deputies performing duties as prescribed by the secretary of defense. The second deputy position was not filled until December 1975. Robert Ellsworth, serving from December 23, 1975, until January 10, 1977, was the only one to ever hold that office. , October 21, 1977, established two under secretaries of defense and abolished the second deputy position. ==Responsibilities==

By delegation, the deputy secretary of defense has full power and authority to act for the secretary of defense and to exercise the powers of the secretary of defense on any and all matters for which the secretary is authorized to act pursuant to statute or executive order. The deputy secretary, among the office's many responsibilities, chairs the Senior Level Review Group (SLRG), before 2005 known as Defense Resources Board (DRB), which provides department-wide budgetary allocation recommendations to the secretary and the president. Traditionally, the deputy secretary has been the civilian official guiding the process of the Quadrennial Defense Review (QDR). The deputy secretary of defense chairs the Special Access Program Oversight Committee (SAPOC), which has oversight responsibilities and provides recommendations with respect to changes in status of the department's Special Access Programs, for either the deputy secretary defense or the secretary of defense to make. == List of deputy secretaries of defense ==