Participants line up at the U.S. Army display booths to receive a Tough Mudder San Diego personalized Identification tag, and perform pullups after completion of the Tough Mudder event in San Diego, Ca., on Nov 10, 2013. Tough Mudder is a 12-mile long endurance challenge designed to test mental as well as physical strength through 22 obstacles along the course. (U.S. Army photo by Staff Sgt. Marie Adams)
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SAN DIEGO, CA, US
This work, Tough Mudder 2013 [Image 1 of 21], by SSG Marie Adams, identified by DVIDS, is free of known copyright restrictions under U.S. copyright law.