U.S. Air Force Staff Sgt. Ben Clouse, 6th Air Refueling Squadron KC-10 flight engineer, conducts a pre-flight inspection inside a KC-10 Extender at Eielson Air Force Base, Alaska, June 2, 2018. Clouse served as the primary flight engineer on a mission to provide refueling support for two Air Force F-15C Eagle aircraft assigned to the 18th Wing at Kadena Air Base, Japan. (U.S. Air Force photo by Tech. Sgt. James Hodgman)