Senior Airman Daniel Apolinar, 434th Aircraft Maintenance Squadron aircraft electric and environmental system journeyman, removes the safety wire from an oil drain bolt of the air cycle machine on a KC-135R Stratotanker during a home-station check at Grissom Air Reserve Base, Ind., July 12, 2014. An ACM is a refrigeration unit of an environmental control system on KC-135s used to provide cabin ventilation. (U.S. Air Force photo/Staff Sgt. Ben Mota)
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