2013-10-05 A KC-135 Stratotanker flies through the sunset sky as it prepares to land at Transit Center at Manas, Kyrgyzstan, Sept. 30, 2013.
According to Boeing, KC-135s made 813,000 aerial refueling combat sorties during the Vietnam conflict.
In the Persian Gulf War, the tankers conducted 18,700 hookups, transferring 278 million pounds of fuel.
The aircraft remains the Air Force’s primary aerial refueling airplane.
(U.S. Air Force photo/Staff Sgt. Robert Barnett)