Tech. Sgt. Stephanie Ambler, Armed Forces Medical Examiner System laboratory technician, left, crawls along a dirt mound during the GORUCK Light team cohesion challenge Sept. 25, 2015, on Dover Air Force Base, Del. Ambler stated at the completion of the five-hour-long challenge led by a former U.S. Marine Corps reconnaissance member, that she was physically tired but mentally proud of herself. (U.S. Air Force photo/Roland Balik)
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