Members of the Coast Guard rappel down the face of Joint Base Lewis-McChord's four-story rappel tower during one of the Mangudai events, May 1, 2013. The Mangudai is intended to challenge its participants, taking them out of their comfort zone and forcing them to endure difficult challenges and rigorous conditions over a three-day period. (U.S. Coast Guard photo by Petty Officer 3rd Class Jordan Akiyama)