Swimmers dive in for their second lap at the harbor during the 28th Annual Triathlon at Marine Corps Air Station Iwakuni, Japan, Oct. 25, 2015. Approximately 100 station residents and Japanese athletes endured the demanding course, finishing with a rowdy crowd cheering them across the finish line. - Swimmers dive in for their second lap at the harbor during the 28th Annual Triathlon at Marine Corps Air Station Iwakuni, Japan, Oct. 25, 2015. Approximately 100 station residents and Japanese athletes endured the demanding course, finishing with a rowdy crowd cheering them across the finish line.