Royal Thailand Marines, along with U.S. infantry Marines with Battalion Landing Team, 2nd Battalion, 5th Marine Regiment, 31st Marine Expeditionary Unit, 3rd Marine Expeditionary Brigade Forward, III Marine Expeditionary Force, assault the beachhead in a amphibious assault raid here Feb. 10, during Exercise Cobra Gold 2011. Cobra Gold is a regularly scheduled multinational training exercise designed to improve partner nation interoperability.