In 2002, the lead ship (DDH 975) of the 5,500-ton "Chungmugong Yi Sunshin"-class destroyers was launched. In 2005, an 18,800-ton amphibious transport dock, ROKS "Dokdo" (LPH 6111) was launched. In 2006, the ROK Navy launched the lead ship (SS 072), which was named after the first Chief of Naval Operations, of the 1,800-ton "Sohn Wonyil"-class submarine equipped with an Air-Independent Propulsion (AIP) system. In May 2007, the ROK Navy launched the lead ship (DDG 991) of the 11,000-ton "Sejong the Great"-class destroyers, built around the American-made AEGIS combat system and the SPY-1D(v) multi-function phased array radar. In December 2008, the ROK Navy commissioned the fast missile craft ROKS "Yoon Youngha" (PKG 711), which was named after the skipper of ROKS "Chamsuri 357".