U.S. Marines cross a three-strand bridge through the treetop canopy. U.S. Marines cross a three-strand bridge through the treetop canopy at the beginning of an endurance course at the Jungle Warfare Training Center on Camp Gonslaves, Okinawa, Japan, on Feb. 25, 2005. The course is a 3.4-mile obstacle course and is part of a weeklong jungle skills training class. SHARE: Download: Full Size (0.09 MB) Credit: VIRIN: 674211-K-PFC67-416.jpg Photo Gallery