Staff Sgt. Amanda Mitchell, 931st Maintenance Squadron, calibrates an eddy current probe prior to inspecting a KC-135 Stratotanker's bulkhead for cracks while Staff Sgt. Bryan Tyler, 22nd Maintenance Squadron, calibrates an ultrasonic transducer prior to testing for subsurface defects. (Air Force photo by Tech. Sgt. Brannen Parrish)
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