U. S. Marin Corps Mud Run
Participants at the U.S. Marine Corps Mud Run quickly make their way down a steep muddy hill, just one of the many obstacles during the race, Oct. 15, 2011, Columbia, S.C. The USMC Mud Run is a 5.2-mile course with 36 obstacles that each team needs to maneuver, requiring team work and loads of determination. The 5.2-mile course is an all-terrain race conducted on trails to include mud holes, walls, trenches, and other challenging obstacles that require swimming, crawling, climbing and jumping. (U.S. Air Force photo by Senior Airman Kenny Holston/Released)