U.S. Air Force Staff Sgt. Greg Penrod, a crew chief with the 20th Aircraft Maintenance Squadron, performs a postflight exhaust inspection on an F-16 Fighting Falcon aircraft assigned to the 77th Fighter Squadron at Eielson Air Force Base, Alaska, June 14, 2012, during exercise Red Flag-Alaska 12-2. Red Flag-Alaska is a series of Pacific Air Forces commander-directed field training exercises for U.S. forces, providing joint offensive counter-air, interdiction, close air support, and large force employment training in a simulated combat environment. (DoD photo by Tech. Sgt. Michael R. Holzworth, U.S. Air Force/Released)
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