MOUNTAIN HOME AIR FORCE BASE, Idaho -- Col. James McGovern, 366th Operations Group commander, cuts the cake celebrating the Air Force’s 61st birthday at the Gunfighter Club Sept. 18. The Air Force was established on Sept. 18, 1947, when President Harry S. Truman signed the National Security Act was signed by. Currently, the Air Force has a total strength of more than 300,000 people and more than 5,000 aircraft. (U.S. Air Force photo/ Airman 1st Class Ashley Tank)