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ALTUS AIR FORCE BASE, Okla. – Wiley Smith, KC-135 Stratotanker refueling aircraft flightline maintainer, grabs a tool in Hangar 285, July 28, 2015. The 97th Maintenance Directorate is made up of around 400 workers, mostly civilian maintainers. (U.S. Air Force photo by Airman 1st Class Kirby Turbak/Released)