U.S. Air Force Staff Sgt. Brian, 447th Expeditionary Aircraft Maintenance Squadron crew chief, unhooks a tow bar from the front of a KC-135 Stratotanker Nov. 11, 2016, at Incirlik Air Base, Turkey. The KC-135 Stratotanker has provided core U.S. Air Force aerial refueling capability for more than 50 years. (U.S. Air Force photo by Staff Sgt. Jack Sanders)