A participant performs pullups to earn an Army backpack from the U.S. Army display booth at the Tough Mudder event in San Diego on Nov. 9, 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.