Challengers of the Army's Mangudai challenge cross American Lake at Joint Base Lewis-McChord, Wash., toward the finish line after spending three days completing obstacles and marching in full combat gear for more than 29 miles, May 3, 2013. Enlisted Army, Air Force and Coast Guard members were given one MRE which participants had to ration between two people for the three-day event. (U.S. Coast Guard photo by Seaman Crystal Saladino)