United States Naval Ship Sacagawea prepares to port at the Gwangyong seaport, South Korea, Feb. 19, 2016, in efforts to support exercise Ssang Yong. Exercise Ssang Yong 2016 is a biannual military exercise focused on strengthening the amphibious landing capabilities of the Republic of Korea, the U.S., New Zealand and Australia. (U.S. Marine Corps photo by MCIPAC Combat Camera Cpl. Allison Lotz/Released)