U.S. Air Force Tech. Sgt. Jason, 912th Air Refueling Squadron crew chief, stands watching a KC-135 Stratotanker after marshalling it onto the taxiway for its flight Sept. 19, 2016, at Incirlik Air Base, Turkey. One of a crew chiefs responsibilities is to guide aircraft safely onto the taxiway. (U.S. Air Force photo by Staff Sgt. Jack Sanders)