Air Force Day was established on August 1, 1947, by President Truman “in recognition of the personnel of the victorious Army Air Forces and all those who have developed and maintained our nation’s air strength.” August 1 was chosen to mark the 40th anniversary of the establishment, in 1907, of the Aeronautical Division in the Office of the Chief Signal Officer of the Army. Thanks to USA Today for giving the Air Force a shout out on their Vine. “It’s U.S. Air Force Day! Thanks to those who serve.”