Senior Airman Nicholas Porter, 749th Aircraft Maintenance Squadron crew chief, performs maintenance checks July 15, 2016 after landing at Luke Air Force Base, Arizona. An aircrew of 70th Air Refueling Squadron members departed Travis Air Force Base, Calif., July 11, 2016 en route to Royal Air Force Base Fairford in Gloucestershire, England. The purpose of the trip is to refuel F-35A Lightning II jet fighters that are returning to the United States after participating in the world's largest air show. (U.S. Air Force photos by Staff Sgt. Madelyn Brown)