U.S. Air Force Airman 1st Class Shay Oakley, 1st Maintenance Squadron Nondestructive Inspection journeyman, inspects a piece of an aircraft at Joint Base Langley-Eustis, Va., Dec. 5, 2016. After applying a fluorescent penetrant, NDI specialists are able to identify indiscretions on an aircraft part using a black light. (U.S. Air Force photo by Senior Airman Kimberly Nagle)