U.S. Marine Corps Lance Cpl. David N. Scott, top, a crew chief with Combat Assault Battalion, III Marine Expeditionary Force, instructs Marines with the 3rd Battalion, 12th Marine Regiment on the operation of assault amphibious vehicles March 27, 2014, at Suesongri Range in Pohang, South Korea, 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.