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U.S. Marine Cpl. Richard Alston, an infantry squad leader with 1st Platoon, Echo Company, Battalion Landing Team, 2nd Battalion, 5th Marines, 31st Marine Expeditionary Unit, shakes hands with a Royal Thai Marine squad leader Feb. 14, 2017 at Ban Chan Krem, Thailand. Cobra Gold is the largest Theater Security Cooperation exercise in the Indo-Asia-Pacific region and is an integral part of the U.S. commitment to strengthen engagement in the region. During patrols of the Indo-Asia Pacific region, the 31st MEU engages partner nations to sustain theater security and continue integrated bilateral training, furthering cohesion between our militaries.