A formation of F-16 Fighting Falcons assigned to the 100th Fighter Squadron, Dannelly Field, Ala., waits to refuel over the Joint Pacific Alaska Range Complex during RED FLAG-Alaska 13-3 Aug. 19, 2013, Eielson Air Force Base Alaska. The JPARC airspace covers more than 67,000 square miles and is the largest military air-ground training complex in North America. (U.S. Air Force photo by Staff Sgt. Miguel Lara III/Released)