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Technical Sgt. Richard Fisher prepares to perform routine maintenance on the engine of a KC-135 Stratotanker at Selfridge Air National Guard Base, Mich., Dec. 4, 2010. Maintenance personnel at Selfridge perform a series of regular inspections and preventative maintenance actions to ensure the KC-135s are mission ready. (U.S. Air Force photo by TSgt. Dan Heaton) (RELEASED)
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