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.
United States Air Force Security Forces
On 12 February 1942 the United States adopted the British air defense philosophy. The Army Chief of Staff, Gen. George C. Marshall, approved the allocation of 53,299 African-Americans to the Army Air Forces with the "stipulation that air base defense 'for the number of air bases found necessary' be organized and that 'Negro personnel' be used for this purpose as required." This order formed the Army Air Forces (AAF) air base security battalions in June 1942. Units were deployed throughout the European, Asian and African theaters and designed to defend against local ground attacks. These units were armed with rifles, machine guns and 37mm guns.