Builder 3rd Class Marcos Lopez, a Seabee assigned to Naval Mobile Construction Battalion Four Zero (NMCB-40), low-crawls through a trench during the endurance course at the Jungle Warfare Training Center on board Camp Gonslaves, Okinawa.

Okinawa, Japan (Feb. 25, 2005) Builder 3rd Class Marcos Lopez, a Seabee assigned to Naval Mobile Construction Battalion Four Zero (NMCB-40), low-crawls through a trench during 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-005