Stephanie Zvonik, Computer Science Corporation aircraft mechanic 1 nondestructive inspection technician, pours a sample of aircraft engine oil to perform a joint oil analysis, Aug. 1, 2011, at Nellis Air Force Base, Nev. The analysis of aircraft oils can detect wear of individual parts. Without it, major components can fail going undetected. Zvonik tests up to 80 samples a day. (U.S. Air Force photo by Senior Airman Stephanie Rubi/Released)
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