caption: A participant of the U.S. Marine Corps Mud Run looks up at the obstacle ahead of him while making his way through a mud pit, Oct. 15, 2011, Columbia, S.C. More than 7,000 people participated in this year?s mud run. Due to the increasing interest in the mud run, the once annual event is now held twice a year to accommodate everyone who wants to compete. (U.S. Air Force photo by Senior Airman <PERSON>/Released)
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