NDI personnel ensure aircraft safety, enhance readiness Published Feb. 22, 2022 51st Fighter Wing Public Affairs OSAN AIR BASE, Republic of Korea -- Airman 1st Class Hunter Trowbridge, 51st Maintenance Squadron Nondestructive Inspection (NDI) apprentice, showcases the penetrant glow on her gloves at Osan Air Base, Republic of Korea, Feb. 17, 2022. The bright glow of the penetrant makes it easier for NDI personnel to spot any cracks, corrosion or general inconsistencies on materials by then placing them under a black light. (U.S. Air Force photo by Senior Airman Allison Payne)