Airman 1st Class Joshua Koch completes a pre-flight check while communicating with the pilot of the F-16 Fighting Falcon before a training mission at Red Flag Feb. 23, 2010, at Nellis Air Force Base, Nev. Red Flag is a realistic combat training exercise involving the air forces of the United States and its allies. Airman Koch is a crew chief with the 20th Aircraft Maintenance Squadron at Shaw AFB, S.C. (U.S. Air Force photo/Tech. Sgt. Michael R. Holzworth)
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