U.S. Air Force Senior Airman Kellyn Harris, 1st Maintenance Squadron non-destructive inspection journeyman, prepares a joint oil analysis program at Langley Air Force Base, Va., Jan. 21, 2015. The joint oil analysis program burns oil samples to ensure an accurate reading of metals in the oil. (U.S. Air Force photo by Airman 1st Class Breonna Veal/Released)