Marines from the Royal Thai Marine Corps Secuity Regiment stand in formation Feb. 13, 2018, during the opening ceremony of Exercise Cobra Gold 2018 at U-Tapao International Airport, Ban Chang district, Rayong province, Thailand. Exercise Cobra Gold, in its 37th iteration, is designed to advance regional security and ensure effective responses to regional crises by bringing together a robust multinational force to address shared goals and security commitments in the Indo-Pacific region. The annual exercise is conducted in the Kingdom of Thailand held from Feb. 13-23 with seven full participating nations. - Marines from the Royal Thai Marine Corps Secuity Regiment stand in formation Feb. 13, 2018, during the opening ceremony of Exercise Cobra Gold 2018 at U-Tapao International Airport, Ban Chang district, Rayong province, Thailand. Exercise Cobra Gold, in its 37th iteration, is designed to advance regional security and ensure effective responses to regional crises by bringing together a robust multinational force to address shared goals and security commitments in the Indo-Pacific region. The annual exercise is conducted in the Kingdom of Thailand held from Feb. 13-23 with seven full participating nations.