U.S. Marines with the 3rd Battalion, 12th Marine Regiment conduct Mark 19 40 mm grenade machine gun and M2 machine gun training with assault amphibious vehicles at Suesongri Range, South Korea, March 27, 2014, during exercise Ssang Yong 2014. Ssang Yong is a combined U.S.-South Korean combat readiness and joint/combined interoperability exercise designed to advance South Korean command and control capabilities through amphibious operations.