The Marine Corps Marathon's (MCM) muddiest event, Run Amuck, hosts 3,000 registered runners on a 3.5 mile course with another 1,000 Mini-Run Amuck runners navigating a 1.5 mile scaled version of the course that features grueling obstacles, steep hills and deep mud pits on Marine Corps Base Quantico, VA.

Runners will shimmy through the low crawl, tangle with the berm climb, smash through water blasts and slosh through giant mud pits, all within the watchful eye and motivating presence of the U.S. Marines.