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.
Numbered Air Force
The table below lists current and historical numbered air forces of the US Air Force, their C-NAF designation (if applicable), their current shield and station, and the major command (MAJCOM) to which they are currently assigned. Note that the lineage of some numbered air forces is continued by non-NAF organizations (e.g., the 15th Expeditionary Mobility Task Force continues the lineage of the Fifteenth Air Force). Boldface indicates a NAF or C-NAF that is currently active.
Named Air Forces operate at the same level as Numbered Air Forces. General Headquarters Air Force, the first named air force of the United States Army's air arm, began operations in 1935. The GHQ Air Force became the Air Force Combat Command in 1941. Several of the numbered air forces began as named air forces.