Air Force F-16 Fighting Falcons refuel behind a KC-135 Stratotanker during Red Flag-Alaska 15-2 while flying over the Joint Pacific Alaska Range Complex, May 11, 2015. The exercise allows participating units to exchange tactics, techniques and procedures as well as improve interoperability. The F-16 is assigned to the 18th Aggressor Squadron on Eielson Air Force Base, Alaska. The Stratotanker is assigned to the Pennsylvania Air National Guard’s 171st Air Refueling Wing.