Stock Photo Description: U.S. Air Force Airman 1st Class Matthew Crane, an avionics journeyman with the 55th Aircraft Maintenance Unit, Shaw Air Force Base, S.C., troubleshoots an inertial navigation system fault on an F-16 Fighting Falcon aircraft during exercise Red Flag 07-1 at Nellis Air Force Base, Nev., Oct. 18, 2006. (U.S. Air Force photo by Staff Sgt. Colette M. Bennett). Stock photography by Department of Defense Public Domain.