U.S. Air Force Staff Sgt. Nathan Lilly, 18th Equipment Maintenance Squadron Nondestructive Inspection technician, checks an aircraft part for cracks at the NDI shop on Kadena Air Base, Japan, Nov. 5, 2013. NDI uses multimillion-dollar equipment including an X-ray machine and a special dye that glows under a black light to inspect the integrity of roughly 500 parts a month. (U.S. Air Force photo by Senior Airman Maeson L. Elleman)