LANGLEY AIR FORCE BASE, Va. – Senior Airman Laquisha Smith, 1st Equipment Maintenance Squadron non-destructive inspection journeyman, pours a D12-5 oil standard which is used in the process of making sure a joap unit is calibrated correctly Oct. 16. The joap samples jet oil for contamination. NDI uses techniques that hospital technicians use, such as x-ray and ultrasound, to conduct their inspections, according to Chief Master Sgt. Stacy Brandt, fabrications flight chief. (U.S. Air Force Photo/Airman 1st Class Zachary Wolf)