BAENGNYEONGDO ISLAND, South Korea – A Republic of Korea Marine scans the horizon from an outpost just 17 km (10.5 miles) from the shores of North Korea, and just 7 km (4.3 miles) from the “Northern Limit Line,” the water boundary of between the two nations. The island, known to Americans as “PY-do,” and to South Koreans as “Baengnyeongdo,” has been a flashpoint in relations between North and South Korea. North Korea sunk the South Korean naval vessel Cheonan near the island March 26, 2010, killing 46 sailors, and fired artillery shells at the nearby Yeonpyeong Island Nov. 23, 2010, killing two South Korean Marines and two civilians.(U.S. Army photo by Staff Sgt. Keith Anderson, U.S. Forces Korea PAO)