Two U.S. Air Force F-16 Fighting Falcons assigned to the 13th Fighter Squadron, Misawa Air Base, Japan, taxi on the Eielson Air Force Base, Alaska, flightline May 5, 2015, during RED FLAG-Alaska (RF-A) 15-2. RF-A is a series of Pacific Air Forces commander-directed field training exercises for U.S. and partner nation forces, providing combined offensive counter-air, interdiction, close air support and large force employment training in a simulated combat environment. (U.S. Air Force photo by Staff Sgt. Joshua Turner/Released)