Master Sgt. Valerie Nelson, 434th Maintenance Squadron nondestructive inspection noncommissioned officer in charge, explains how to use a magnetic particle inspection to find cracks in a main wheel rotor drive key to Cassie Dull, honorary Marine Corps Reserve commander, during a tour of Grissom maintenance recently. Dull was joined by Leilan McNally, honorary 434th Maintenance Group commander, and Jessica Green, honorary 434th Operations Group commander. (U.S. Air Force photo/Tech. Sgt. Mark Orders-Woempner)
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