U.S. Marines with Charlie Company, 2nd Assault Amphibian Battalion, 31st Marine Expeditionary Unit disembark from the container and roll-on/roll-off ship USNS 1st LT Jack Lummus (T-AK 3011) as part of a maritime preposition force training evolution during exercise Cobra Gold 2011 in the Gulf of Thailand on Jan. 23, 2011. Cobra Gold is a regularly-scheduled joint/combined exercise designed to ensure regional peace and strengthen the ability of the Royal Thai Armed Forces to defend Thailand and respond to regional contingencies.