Staff Sgt. Justin Swearingen collects an oil sample March 3, 2015, during exercise Beverly Midnight 15-1, at Osan Air Base, South Korea. The oil is checked every 10 hours to ensure that it is free of metal. Swearingen is an A-10 Thunderbolt II crew chief assigned to the 51st Aircraft Maintenance Squadron. (U.S. Air Force photo/Senior Airman Matthew Lancaster)
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