Airman 1st Class Michael Griffin uses a stationary penetrant line Nov. 3, 2014, at Langley Air Force Base, Va. A penetrant is used to detect discontinuities, such as cracks and pits, open to the surface on parts made of nonporous materials. Griffin is a 1st Maintenance Squadron nondestructive inspection technician. Staff Sgt. Antoinette Gibson

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Keywords: .., air, airmen, base, defense, force, inspection, jble, langley, maintenance, military, ndi, nondestructive, united, virginia, war