Today in History – September 18, 1947 – The USAF becomes an independent armed service
18 September 1947 – The United States Army Air Forces separates from the United States Army and becomes an independent armed service, the United States Air Force. Initially formed as a part of the United States Army on 1 August 1907, the USAF was established as a separate branch of the U.S. Armed Forces on 18 September