Master Sgt. Valerie Nelson, back, explains to Jessica Green, left, how a spectrometric oil analysis machine burns used engine oil from a KC-135R Stratotanker to determine what might be breaking down inside an aircraft engine as Airman 1st Class Bianca Upshaw, center, demonstrates. Green is the 434th Operations Group honorary commander, Nelson is a 434th Maintenance Squadron nondestructive inspection noncommissioned officer in charge, and Upshaw is a 434th MXS NDI apprentice. (U.S. Air Force photo/ Tech. Sgt. Mark Orders-Woempner)
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