Airmen with the 1st Special Operations Equipment Maintenance Squadron non-destructive inspection flight use a black light to search for cracks inside a 40mm weapon attached to an AC-130U Spooky Gunship on Hurlburt Field, Fla., July 21, 2015. The NDI flight is responsible for detecting the smallest imperfections, wear and cracks on aircraft as well as aerospace ground equipment. (U.S. Air Force photo by Senior Airman Christopher Callaway)