Airman 1st Class Cory Kalin sprays a piece of metal during a penetrant test June 18, 2014, on Atlantic City Air National Guard Base, Penetrant testing detects surface cracks, corrosion, scratches and other surface impurities which create cavities and voids on the surface of metals or other structural materials. Kalin is a nondestructive inspection specialist with the New Jersey Air National Guard's 177th Aircraft Maintenance Squadron. Tech. Sgt. Matt Hecht

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