U.S. Air Force Established
After 40 years and two wars, the aeronautical division of the U.S. military was established as its own branch, the Air Force, on September 18, 1947.
What would later become the Air Force was originally created as an aeronautical division of the Army Signal Corps in 1907. The next year, the Army purchased its first plane, and in 1911, Congress appropriated funds for aviation. Control passed to the aviation division in 1914.