Royal Thai Marine Corps advance toward the objective while U.S. Marines of the 31st Marine Expeditionary Unit provide security during the multilateral amphibious assault here Feb. 10. The Marines were conducting a multilateral amphibious assault with Royal Thai Marines and Republic of Korea Marines during Exercise Cobra Gold 2012. CG 2012 demonstrates the commitment of the U.S. and participating nations to increase interoperability and promote security and peace throughout the Asia-Pacific region.