QUANTICO, Va. — Thousands of runners took part in an annual muddy race on the Marine Corps Base in Quantico, Va.

Paul Sweatman of Sebern, Md., washes up after his Run Amuck race in April 2010. (Megan Rossman/WASHINGTON POST)

The races involved running over obstacles and through mud pits. Everyone who was dirty gets watered down for free.

Children ages 5 through 9 participated in the one-mile Kids Run Amuck race.