Cracking down on metal fatigue

RAF MILDENHALL, England -- Staff Sgt. Frank Castonguay, 100th Maintenance Squadron non destructive craftsman, sprays a florescent magnetic bath on a KC-135 Stratotanker up-lock bracket during a magnetic particle inspection Nov. 16, 2010. The bath is used to fill any cracks in a suspected damaged piece of equipment which will then glow under a black light to determine whether it?s damaged. (U.S. Air Force photo/Senior Airman Ethan Morgan)

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