U.S. Air Force Capt. John Christy flies a KC-135 Stratotanker over Afghanistan, Dec. 29, 2015. Christy is a pilot assigned to the 340th Expeditionary Air Refueling Squadron, deployed from the 92nd Air Refueling Wing at Fairchild Air Force Base, Wash. U.S. Air Force photo by Staff Sgt. Corey Hook