Senior Airman Daniel Apolinar, 434th Aircraft Maintenance Squadron aircraft electric and environmental system journeyman, uses technical orders to train Senior Airman Noah Murphy, 434th Aircraft Maintenance Squadron crew chief, on the proper procedures for changing air cycle machine oil on a KC-135R Stratotanker 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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