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 Forces Southern Command
A second permanent army airfield, Albrook Field, opened in 1932 due to France Field becoming too small for the numbers of aircraft being assigned to the Canal Zone, as well as having a poor landing surface; offering no room for expansion, and providing little defense for the Pacific entrance to the Panama Canal. A third airfield, Howard Field was built on the Canal Bruja Point Military Reservation, opening on 1 December 1939. By 1940, a rapid increase in the number of flying squadrons in both the Canal Zone as well as in Panama as a result of the pre–World War II mobilization of the Air Corps warranted a new organization, and the Panama Canal Air Force was created as a major command. After several organizational changes and the establishment of the United States Army Air Forces in 1942, Sixth Air Force became the controlling Air Force command authority for USAAF activities in the Caribbean, as well as in Central and South America. Through all these redesignations it was part of the Caribbean Defense Command, (10 February 1941 – 1 November 1947), which was the senior United States Army headquarters in the Canal Zone. The Caribbean Interceptor Command, was the Air Force component (10 February 1941 – 17 October 1941) of the CIC until being inactivated and replaced by VI Interceptor Command.