Republic of Korea Marines train beside U.S. Marines with 2nd Battalion, 3rd Marines, 4th Marine Regiment to provide cover fire during Vertical Assault training during Ssang Yong 14 at Old Army Tank Battalion Training Site, Pohang, South Korea, April 2, 2014. Exercise Ssang Yong 14 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. Navy Photo by Mass Communication Specialist 3rd Class J. Michael Schwartz/Released)