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In this file photo, U.S. Air Force F-16 Fighting Falcon aircraft assigned to the 121st Fighter Squadron (FS), Joint Base Andrews, Md., and the 112th FS, Toledo Air National Guard Base, Ohio, stand by for launch May 4, 2015, during RED FLAG-Alaska (RF-A) 15-2 at Eielson Air Force Base, Alaska. RF-A 15-2 enables units from around the globe to conduct live-fire training, utilizing more than 67,000 square miles of airspace over the Joint Pacific Alaska Range Complex.