Republic of Korea Marine with 21st Airborne, 1st Marine Division takes cover as enemy force approaches during simulated Vertical Assault Exercise for Ssang Yong 14, at Old Army Tank Battalion, Pohang, South Korea, April 2, 2014. Exercise Ssang Yong is conducted annually in the 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)