U.S. Air Force Tech. Sgt. Andrew Limke, a 113th Wing, District of Columbia Air National Guard crew chief, looks through technical orders for an F-16 Fighting Falcon at Eielson Air Force Base, Alaska, April 27, 2015. The unit is preparing to participate in RED FLAG-Alaska 15-2 large-force employment training. (U.S. Air Force photo by Staff Sgt. Shawn Nickel/Released)