Senior Airman Terrance Kelley tests oil samples in a Spectroil M-unit, at Osan Air Base, Republic of Korea, July 6, 2012, to find trace elements that signal the wear and tear of wear metals in an aircraft. The 51st Maintenance Squadron NDI Airmen use the Joint Oil Analysis Program to look for small trace elements that may cause serviceability issues later. Kelley is a NDI journeyman. (U.S. Air Force photo/Staff Sgt. Stefanie Torres)
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