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Under the light
Airman 1st Class Cory Kalin sprays a piece of metal during a penetrant test June 18, 2014, on Atlantic City Air National Guard Base, N.J. Penetrant testing is a method of detecting 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. (U.S. Air National Guard photo/Tech. Sgt. Matt Hecht)