A Marine with 1st Platoon, Company B., Battalion Landing Team 1st Battalion, 4th Marines, 31st Marine Expeditionary Unit, crawls through a watery ditch and under concertina wire during the Jungle Endurance Course here, April 20. After completing a two-week training evolution at the Jungle Warfare Training Center, the Marines underwent the four-mile-long course through the Okinawan jungle, utilizing the rappelling, rope-crossing, improvised stretcher carry and other skills they learned. The 31st MEU is the only continuously forward-deployed MEU and remains the nation’s force in readiness in the Asia-Pacific region. - A Marine with 1st Platoon, Company B., Battalion Landing Team 1st Battalion, 4th Marines, 31st Marine Expeditionary Unit, crawls through a watery ditch and under concertina wire during the Jungle Endurance Course here, April 20. After completing a two-week training evolution at the Jungle Warfare Training Center, the Marines underwent the four-mile-long course through the Okinawan jungle, utilizing the rappelling, rope-crossing, improvised stretcher carry and other skills they learned. The 31st MEU is the only continuously forward-deployed MEU and remains the nation’s force in readiness in the Asia-Pacific region.