US. Army Reserve soldiers Pfc. Ryan Erickson and Sgt. Robert Jackson assigned to the 386th Engineer Company in Las Vegas, scale the inclined and declined monkey bars across a pit of cold water 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. (US. 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.