U.S. airmen talk with maintainers before a refueling operation in a KC-135 Stratotanker aircraft from Al Udeid Air Base, Qatar, Jan. 6, 2016. The airmen are assigned to the 340th Expeditionary Air Refueling Squadron. The operation is part of the coalition's counter-ISIL efforts. U.S. Air Force photo by Staff Sgt. Corey Hook