U.S. Marine Corps Lance Cpl. David N. Scott, left, a crew chief with Combat Assault Battalion, III Marine Expeditionary Force, adjusts his helmet while conducting Mark 19 40 mm grenade machine gun and M2 machine gun training aboard an assault amphibious vehicle 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.