United States Air Force
The U.S. War Department created the first antecedent of the U.S. Air Force, as a part of the U.S. Army, on 1 August 1907, which through a succession of changes of organization, titles, and missions advanced toward eventual independence 40 years later. In World War II, almost 68,000 U.S. airmen died helping to win the war, with only the infantry suffering more casualties. In practice, the U.S. Army Air Forces (USAAF) was virtually independent of the Army during World War II, and in virtually all ways functioned as an independent service branch, but airmen still pressed for formal independence. The National Security Act of 1947 was signed on 26 July 1947 by President Harry S Truman, which established the Department of the Air Force, but it was not until 18 September 1947, when the first secretary of the Air Force, W. Stuart Symington, was sworn into office that the Air Force was officially formed as an independent service branch.
Air Force Systems Command
However, the Army Air Forces needed to achieve independence, which it did on 18 September 1947, with its transition into an independent United States Air Force. Also, the role of the Air Force in the postwar world had to be defined. The 1948 Finletter Commission published its report, "Survival in the Air Age", in January 1948. It set forth a new concept of airpower, i.e., a powerful peacetime force able to counter any enemy air attack. The Finletter Report inspired a group of senior USAF officers with backgrounds in engineering and related fields to analyze the existing R&D organization. Their findings, and the salesmanship of Generals Jimmy Doolittle and Donald Putt, convinced Air Force Chief of Staff General Hoyt S. Vandenberg to put the R&D mission on a more equal footing with the operational Air Force. Accordingly, and in the face of intense Air Staff opposition, on 23 January 1950, the Research and Development Command (RDC) came into being. Eight months later it was re-designated the Air Research and Development Command (ARDC) as a separate organization devoted strictly to research and development.