U.S. Marine Corps Staff Sgt. Michael H. Casey, a section leader with Combat Assault Battalion, III Marine Expeditionary Force, sits atop an assault amphibious vehicle 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.