US. Army Reserve soldiers Sgt. Anthony Kelly, Sgt. Robert Jackson and Pfc. Ryan Erickson assigned to the 386th Engineer Company in Las Vegas, walk to the finish line after completing the last obstacle at the Tough Mudder event in San Diego, 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.