Singing Sergeants, the official chorus of the U.S. Air Force, sings during the U.S. Air Force Band’s 75th Anniversary celebration June 11, 2016, at George Mason University’s Center for the Arts Concert Hall in Fairfax, Va. The Singing Sergeants sang an a cappella iteration of ‘Freedom Song’. (U.S. Air Force photo by Airman 1st Class Philip Bryant)