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Senior Airman Rilee Skeen, 931st Aircraft Maintenance Squadron, cleans the axle on the main landing gear of a KC-135 Stratotanker during a tire change at McConnell Air Force Base, Kan., Dec. 7, 2014. The tire change procedure took place during the December Unit Training Assembly and gave members of the 931 MXS an opportunity to refresh practical aircraft maintenance skills. (U.S. Air Force Photo by Lt. Col. Tsuyoshi Tung)