List of active Republic of Korea Navy ships
The Republic of Korea Navy has about 160 ships in commission (a total displacement of about 232,285 tonnes). The vessels are categorized into four levels. A first-rate ship ("Sohn Wonyil-"class SS, DDG, DDH, LPH, MLS, and AOE) is commanded by a captain; a second-rate ship (SS, FFG, FF, PCC, LST, ATS, and ASR) by a commander; a third-rate ship (PKG, MSH, and MHC) by a lieutenant commander; and a fourth-rate craft (PKMR, PKM, and LSF) is commanded by a lieutenant or a warrant officer. The ROK Navy employs  the U.S. Navy-style letter based hull classification symbols to designate the types of its ships and hull numbers to uniquely identify its vessels (e.g. DDH 975). The names are that of the historical figures, provinces, cities, counties, peaks, lakes, islands, and birds. The Chief of Naval Operations selects the names of ships. The ship prefix for all the commissioned ROK Navy ship is ROKS (Republic of Korea Ship) when the names of ships are written in English. Submarine fleet. Submarines. Submarines (SS) are named after historical figures. Surface fleet. Destroyers. Destroyers (DDG, DDH) are named after historical figures. Frigates . Frigates (FFG, FF) are named after provinces and large cities that names previous ROK Navy destroyers had. Corvettes. Corvettes (PCC) are named after cities, with the exception of "Sinseong" (one of Admiral Yi Sunshin's battle grounds). Patrol vessels. "Yoon Youngha" class (PKG) is named for Navy heroes. "Chamsuri" (PKM) means the sea eagle in Korean. Amphibious warfare ships. "Dokdo class" (LPH) is named for islands. "Cheonwangbong" class and "Gojunbong" (LST) class are named for mountain peaks. "Solgae" (LSF) means the black kite in Korean. Mine warfare ships. "Nampo" class and "Wonsan" class (MLS) are named after places known for  naval mine operations during the Korean War. "Yangyang" class (MSH) is named for sea-side counties. "Ganggyeong" class (MHC) is named for towns that names are previously used by decommissioned minesweepers. Auxiliary ships. ATH is named for an island where Admiral Yi Sunshin's HQ was located. AOEs are named for lakes. "Tongyeong" class have legacy names of previous ROK Navy ships. ASR is named for a base established by Commissioner Chang Bogo. "Singiwon" and "Sinsegi" (AGS) mean a new era and a new century in Korean, respectively. "Mulgae" (LCU) means the fur seal in Korean. Major service craft. The  hull number of service craft starts with Hangul. Service craft have no name. Notes. a. Hull number: The ROK Navy does not use the number '4' when assigning hull numbers to their ships since ROKS "Jirisan" (PC 704; formerly USS "PC-810"), during the Korean War, struck a mine and sank in December 1951, resulting in death of all sailors aboard. Currently only the hull numbers of the mine layers and submarine tender end with number '0'. The hull numbers of the submarines start with the number '0'. b. Romanization of Ship names: Romanization is according to Revised Romanization of Korean  (adopted in 2000), with exceptions of personal names. Names of ships commissioned before 2000 might have been romanized according to McCune–Reischauer. Examples of changes (M-R → RR): Chinhae → Jinhae; Kangnung → Gangneung; Kimpo → Gimpo; Kyongju → Gyeongju; Pusan → Busan; Taegu → Daegu. c. Delivery date: The date when the ROK Navy acquires a ship from the shipbuilder.