A Marine with Battalion Landing Team 2nd Battalion, 7th Marines (BLT 2/7), 31st Marine Expeditionary Unit (MEU), uses a hasty sling to rappel down a 40 foot cliff during independent training at the Camp Gonsalves Jungle Warfare Training Center, April 27. The independent training was a rehearsal for the Endurance Course, a more than three mile hike through thick jungle terrain, where Marines must negotiate 32 obstacles designed to challenge them physically and mentally. (Official Marine Corps photo by Cpl. Michael A. Bianco) - A Marine with Battalion Landing Team 2nd Battalion, 7th Marines (BLT 2/7), 31st Marine Expeditionary Unit (MEU), uses a hasty sling to rappel down a 40 foot cliff during independent training at the Camp Gonsalves Jungle Warfare Training Center, April 27. The independent training was a rehearsal for the Endurance Course, a more than three mile hike through thick jungle terrain, where Marines must negotiate 32 obstacles designed to challenge them physically and mentally. (Official Marine Corps photo by Cpl. Michael A. Bianco)

A Marine with Marine Medium Helicopter Squadron 265 Reinforced (HMM-265 REIN), 31st Marine Expeditionary Unit (MEU), prepares a C-17 Globemaster III aircraft for cool down during a helicopter rotation, April 21. The rotation was in support of the MEU’s Air Combat Element’s (ACE) effort to stay constantly ready as a part of a Maritime Contingency Force. (Official Marine Corps photo by Cpl. Michael A. Bianco) - A Marine with Marine Medium Helicopter Squadron 265 Reinforced (HMM-265 REIN), 31st Marine Expeditionary Unit (MEU), prepares a C-17 Globemaster III aircraft for cool down during a helicopter rotation, April 21. The rotation was in support of the MEU’s Air Combat Element’s (ACE) effort to stay constantly ready as a part of a Maritime Contingency Force. (Official Marine Corps photo by Cpl. Michael A. Bianco)