Tech. Sgt. Christopher Gambadella, 362 Training Squadron crew chief instructor, teaches Airmen how to service the hydraulic reserve system at Sheppard Air Force Base, Texas, July 18, 2018. Proper maintenance of the hydraulic system is critical; these airmen will perform this hydraulic test before every flight. The Airmen have been assigned as KC-135 crew chiefs and will graduate Aug. 16, 2018. (U.S. Air Force photo by Senior Airman Kevin Clites)

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Photo by: Senior Airman Kevin Clites |  VIRIN: 180719-F-KC646-7500.JPG