Corporal Jervis Hettrick (left), bridge master, and Lance Cpl. Christopher De Casanova (right), combat engineer, Bridge Platoon, Bridge Company, 7th Engineer Support Battalion, 1st Marine Logistics Group, work together to move a roller beam that will support a bridge, May 29, 2014 for the World Famous Camp Pendleton Mud Run aboard Camp Pendleton, Calif. The annual Mud Run is a 10-kilometer race with several obstacles, which can be negotiated individually or as a team. This year they built a bridge spanning 71 feet and weighing almost nine tons. On June 6, the Marines who built the bridge plan to participate in Mud Run, as a unit, to increase morale. They will also be volunteering to support the event. (U.S. Marine Corps photo by Lance Cpl. Keenan Zelazoski/ Released) - Corporal Jervis Hettrick (left), bridge master, and Lance Cpl. Christopher De Casanova (right), combat engineer, Bridge Platoon, Bridge Company, 7th Engineer Support Battalion, 1st Marine Logistics Group, work together to move a roller beam that will support a bridge, May 29, 2014 for the World Famous Camp Pendleton Mud Run aboard Camp Pendleton, Calif. The annual Mud Run is a 10-kilometer race with several obstacles, which can be negotiated individually or as a team. This year they built a bridge spanning 71 feet and weighing almost nine tons. On June 6, the Marines who built the bridge plan to participate in Mud Run, as a unit, to increase morale. They will also be volunteering to support the event. (U.S. Marine Corps photo by Lance Cpl. Keenan Zelazoski/ Released)