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An F-22 Raptor is securely tethered to the center of an engine testing zone during the final phase for student maintainer certification 18 July during an operational engine run at Tyndall. Phase three is the culmination of academic, simulator and hands-on training after a prerequisite of six months airframe training and supervisor recommendation. (U.S. Air Force photo by Tech. Sgt. Javier Cruz/Released)

PHOTO BY: Tech. Sgt. Javier CruzReleased
VIRIN: 140718-F-GA320-029.JPG
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