U.S. Marines cross a three-strand bridge at the beginning of the endurance course at the Jungle Warfare Training Center on board Camp Gonslaves, Okinawa.

Okinawa, Japan (Feb. 25, 2005) U.S. Marines cross a three-strand bridge at the beginning of the endurance course at the Jungle Warfare Training Center on board Camp Gonslaves, Okinawa. The endurance course is a 3.4-mile obstacle course, which is part of a weeklong jungle skill training class. U.S. Navy photo by Photographer's Mate 3rd Class John P. Curtis File# 050225-N-9712C-002