U.S and South Korean marines simulate an assault on Incheon during the 65th annual Incheon Amphibious Landing Operations Commemoration Ceremony in South Korea, Sept. 15, 2015. The event commemorated the Sept. 15, 1950, surprise amphibious landing of more than 40,000 troops led by Gen. Douglas MacArthur during the Korean War. U.S. Navy photo by Petty Officer 1st Class Abraham Essenmacher