Petty Officer 3rd Class Michael Ball, a machinery technician from Maritime Safety and Security Team Base Seattle, prepares for the final leg of the Mangudai challenge at Joint Base Lewis-McChord, Wash., May 3, 2013. Coast Guard members were invited by the Army to participate in the three-day leadership challenge testing physical, mental and emotional endurance. (U.S. Coast Guard photo by Seaman Crystal Saladino)