Tech. Sgt. Joseph Gonzales, 92nd Maintenance Squadron, Aircraft Fuel Systems section chief, peers into the section of a fuel tank training module, a section of a former KC-135 Stratotanker's wing, during a training session at Fairchild Air Force Base, Washington, Nov. 21, 2017. A KC-135 possesses eight, wing-borne fuel tanks and 16 fuel cells in the fuselage of the aircraft. (U.S. Air Force photo/Senior Airman Ryan Lackey)

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Photo by: SrA Ryan Lackey |  VIRIN: 171121-F-HU835-043.JPG