Airmen 1st Class Samuel Gebhart and Gregory Newsom, 22nd Aircraft Maintenance Squadron crew chiefs, simulate checking the engine oil level on a KC-135 Stratotanker for training, June 17, 2016, at McConnell Air Force Base, Kan. Engine oil is checked after every flight to ensure proper quantities are maintained. (U.S. Air Force photos/Airman Erin McClellan)
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