Petty Officer 2nd Class John Iams, an electronics technician at Coast Guard Base Seattle, holds on as he maneuvers himself under and through "The Weaver" on Joint Base Lewis-McChord's obstacle course, May 1, 2013. The Mangudai is an Army event that will test a person's endurance with challenges held over the course of three days where the participants will have almost no sleep and very limited food. (U.S. Coast Guard photo by Petty Officer 3rd Class Jordan Akiyama)