To celebrate the Air Force’s 66th birthday U.S. Air Force Lt. Col. William Wade, Joint Task Force-Bravo deputy commander, and one of 612th Air Base Squadron's junior Airmen, Airman 1st Class Chad Behr, 612th ABS crew chief, cut the Air Force cake here Sept 18, 2013. Initially part of the U.S. Army Air Corps, the now U.S. Air Force, was made into its own military branch on Sept 18, 1947 under the National Security Act of 1947. The U.S. Air Force is one of the strongest and most technologically advanced forces on the planet.