Republic of Korea Marines with 7th Marine Regiment, simulated opposition forces, observe water explosions as Assault Amphibious Vehicles approach shore during Integrated Amphibious Assault Ssang Yong 14 at Doksu-ri Beach, Pohang, South Korea, March 31, 2014. Exercise Ssang Yong is conducted annually in the Republic of Korea (ROK) to enhance interoperability between U.S. and ROK forces by performing a full spectrum of amphibious operations while showcasing sea-based power projection in the Pacific. (U.S. Marine Corps Photo by Cpl. Sara A. Medina, III MEF Combat Camera/Released)