Air Force turns 67
John Kennedy, 20th Force Support Squadron school liaison officer, sings the national anthem at the Air Force’s 67th Birthday celebration at Shaw Air Force Base, S.C., Sept. 18, 2014. On this day in 1947, President Harry Truman signed the National Security Act of 1947, effectively separating the Air Force from the Army. (U.S. Air Force photo by Airman 1st Class Jonathan Bass/Released)