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190719-F-IY571-0226
Staff Sgt. Efren Vaquera, a 1st Special Operations Maintenance Squadron nondestructive inspection specialist, performs a fluorescent-penetrant inspection on an aircraft part at Hurlburt Field, Fla., July 19, 2019. Fluorescent penetrants cause extremely small cracks in aircraft parts to become visible under a black light. (U.S. Air Force photo by Senior Airman Caleb Pavao)