U.S. Air Force Staff Sgt. Nathan Schwalbach, 133rd Maintenance Squadron, inspects a photo negative of an aircraft equipment in St. Paul, Minn., Feb. 26, 2017. Schwalbach is part of the non-destructive inspection team, which uses noninvasive approaches to inspect aircraft gear for flaws such as cracks, voids and heat damage on aircraft parts utilizing various test equipment. (U.S. Air National Guard photo by Tech. Sgt. Amy M. Lovgren/ Released)
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