U. S. Marines low-crawl through muddy trenches during the endurance course at the Jungle Warfare Training Center at 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 Petty Officer 3rd Class John P. Curtis
U.S. Navy Petty Officer 2nd Class Barbera Silkwood, a Seabee assigned to Naval Mobile Construction Battalion 40, emerges from muddy water under razor and barbed wire after going under a log obstacle during the endurance course at the Jungle Warfare Training Center at 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 Petty Officer 3rd Class John P. Curtis
U.S. Navy Petty Officer 3rd Class Marcos Lopez, a Seabee assigned to Naval Mobile Construction Battalion 40, low-crawls through a trench during the endurance course at the Jungle Warfare Training Center at Camp Gonslaves, Okinawa. U.S. Navy photo by Petty Officer 3rd Class John P. Curtis
