Happy birthday, usairforce! 🎈 On September 18, 1947, the U.S. Air Force was officially founded. The National Security Act of 1947 separated the U.S. Air Force from the U.S. Army and allowed the U.S. Air Force to become a separate branch of military service. One of the reasons conordaly22’s usaf_recruiting #Indy500 car carried the No. 47! #AimHigh #USAF73