On November 23, 2010, the Bombardment of Yeonpyeong incident occurred. There was a rigorous engagement between the North Korean army and a South Korean marine corps YP unit. As a result of this event, the South Korean government cancelled its Military Reform Plan 2020 which was to downsize the number of Marine Corps personnel deployed in North-West islands. Instead, the South Korean government established the Military Reform Plan 307 (Plan 307).