U.S. Air Force Senior Airman Kellyn Harris, 1st Maintenance Squadron non-destructive inspection journeyman, sharpens a rod for a joint oil analysis program at Langley Air Force Base, Va., Jan. 21, 2015. The rod burns oil samples to replicate the oil that burns when aircraft land. (U.S. Air Force photo by Airman 1st Class Breonna Veal/Released)