A young boy uses the rope to clime a muddy hill during the annual Marine Corps Marathon's Mini Run Amuck. Run Amuck, the Marine Corps Marathon's messiest mud and obstacle event, hosts 4,000 runners who face arduous obstacles and plenty of mud along a 4 mile course on June 14, 2014 throughout Marine Corps Base Quantico Va. (U.S. Marine Corps photo by James H. Frank/Released)