No crack left undetected
U.S. Air Force Senior Airman Clarence Tobias, 86th Maintenance Squadron nondestructive inspection journeyman, uses a black light to look at magnetic particles on a hoist hook on Ramstein Air Base, Germany, Sept. 6, 2017. Tobias used the alignment of the particles to inspect for hairline fractures on the hook. The inspection ensured the hook, which is used to lift heavy munitions, has no risk of breaking under duress. (U.S. Air Force photo by Senior Airman Elizabeth Baker)