Technical Sgt. James Harper, 372nd Training Squadron Detachment 4 F-22 Raptor fuels system instructor, shows students the fuels system trainer Feb. 2 at the 372nd TS building. Harper trains the students so they can better understand the F-22 fuel system. (U.S. Air Force photo by Airman 1st Class Sergio A. Gamboa/Released)

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Photo by: Airman st Class Sergio A. GamboaReleased |  VIRIN: 150202-F-IH072-237.JPG