Marines with Company A, 4th Tank Battalion, 4th Marine Division, Marine Forces Reserve fire the main gun of their M1A1 Abrams tank April 25 at Suseong-ri Firing Range. The live-fire was conducted as part of Korean Marine Exchange Program 13-7, which is one of three KMEPs taking place during the exercise Ssang Yong 13. Ssang Yong, which means “twin dragons,” is an annual exercise designed to enhance the interoperability of both ROK and U.S. forces. (Marine Corps photo by Lance Cpl. Donald T. Peterson/Released)