U.S. Air Force Airman 1st Class Brittany Fore, 23d Equipment Maintenance Squadron non-destructive inspection unit fabrication flight journeyman, checks for defects in a calibration block, Jan. 12, 2016, at Moody Air Force Base, Ga. Fore uses ultrasonic couplant which is designed to help the ultrasonic system listen for sound disruptions to determine if there’s a defect. (U.S. Air Force photo by Airman 1st Class Greg Nash/Released)