Non-Destructive Inspection
Airman 1st Class Samantha Watkins, 28th Maintenance Squadron non-destructive inspection apprentice, applies a florescent penetrant to a weapons pylon lift assembly during an inspection at Ellsworth Air Force Base, S.D., Feb. 10, 2012. The penetrant seeps into any potential cracks so they become visible during ultra-violet inspection. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)