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 National Guard
Following World War II, the National Guard aviation units that had previously been part of the U.S. Army Air Corps and its successor organization, the U.S. Army Air Forces, became the Air National Guard (ANG), one of two Reserve Components of the newly established United States Air Force.
On September 24, 1957 President Dwight D. Eisenhower federalized the entire Arkansas National Guard to ensure the safe entry of the Little Rock Nine to Little Rock Central High School the following day. Governor Orval Faubus had previously used members of the guard to deny the students entry to the school.