The United States Navy, United States Coast Guard, and United States National Oceanic and Atmospheric Administration (NOAA) use a hull classification symbol to identify their ships by type and by individual ship within a type. The system is analogous to the pennant number system that the Royal Navy and other European and Commonwealth navies use.
ORP Orzeł was the lead ship of her class of submarines serving in the Polish Navy during World War II. Her name means "Eagle" in Polish. The boat is best known for the Orzeł incident, her escape from internment in neutral Estonia during the early stages of the Second World War.
A patrol boat is a relatively small naval vessel generally designed for coastal defence, border protection, immigration law-enforcement, search and rescue duties. There have been many designs for patrol boats. They may be operated by a nation's navy, coast guard, police force or customs and may be intended for marine or estuarine or river environments. They are commonly found engaged in various border protection roles, including anti-smuggling, anti-piracy, fisheries patrols, and immigration law enforcement. They are also often called upon to participate in rescue operations.
The Project 1241 "Molniya" are a class of Soviet missile corvettes. They have the NATO reporting name Tarantul. These ships were designed to replace the Project 205 Tsunami missile boats.
USS Albuquerque (PG-115/PF-7), a Tacoma-class patrol frigate in commission from 1943 to 1945 and from 1950 to 1953, was the first ship of the United States Navy to be named for Albuquerque, New Mexico. She also served in the Soviet Navy as EK-14 and in the Japan Maritime Self-Defense Force as JDS Tochi (PF-16/PF-296) and as YAC-15.
BRP Magat Salamat (PS-20) is one of several Miguel Malvar class of patrol corvettes in service with the Philippine Navy. She was originally built as USS Gayety (AM-239), an Admirable-class minesweeper with a similar hull to the PCE-842-class patrol craft produced during World War II. In 1962 she was transferred to South Vietnam for service in the Republic of Vietnam Navy as RVNS Chi Lang II (HQ-08). She was acquired by the Philippine Navy in April 1976 and later on commissioned as Magat Salamat. Along with other ex-World War II veteran ships of the Philippine Navy, she is considered one of the oldest active fighting ships in the world today.
BRP Miguel Malvar (PS-19) is the lead ship of the Miguel Malvar class of corvettes of the Philippine Navy. She was originally built as USS Brattleboro PCE(R)-852, a PCE(R)-848-class rescue patrol craft escort for the United States Navy during World War II. In 1966 she was transferred to South Vietnam for service in the Republic of Vietnam Navy as RVNS Ngọc Hồi (HQ-12). She was acquired by the Philippine Navy in April 1976 and later on commissioned as Miguel Malvar after Miguel Malvar y Carpio. The ship is in active service. Along with other World War II-era ships of the Philippine Navy, Miguel Malvar is one of the oldest active fighting ships in the world today.
BRP Cebu (PS-28) was a Miguel Malvar-class corvette of the Philippine Navy. She was originally built as USS PCE-881, a PCE-842-class patrol craft for the United States Navy during World War II and patrolled the Alaskan coast during that war. She was decommissioned from the U.S. Navy and transferred to the Philippine Navy in July 1948 and renamed RPS Cebu (E-28) after the Philippine province of the same name. The ship was decommissioned on 1 October 2019. Along with other World War II-era ships of the Philippine Navy, Cebu was considered one of the oldest active fighting ships in the world.
BRP Pangasinan (PS-31) was a Miguel Malvar-class corvette of the Philippine Navy. She was originally built as USS PCE-891, a PCE-842-class patrol craft for the United States Navy during World War II. She was decommissioned from the U.S. Navy and transferred to the Philippine Navy in July 1948 and renamed RPS Pangasinan (E-31).
ORP Batory was a patrol boat of the Polish Border Guard which operated from the 1930s into the 1950s.
Vinnytsia (U206) is an anti-submarine corvette of the Ukrainian Navy. Prior to joining the Ukrainian Navy she was a former KGB Border Guard patrol ship named Dnepr. In March 2014, she was seized by Russian soldiers and de facto came under control of the Russian Black Sea Fleet. The ship was returned to the Ukrainian Navy from Crimea on 19 April 2014.
The BRP Hilario Ruiz (PC-378) is the eighth ship of the Jose Andrada class coastal patrol boats of the Philippine Navy. It is part of the first batch of its class ordered through US Foreign Military Sales (FMS) in 1990, and was commissioned with the Philippine Navy on 1 June 1995. It was initially designated as Fast Patrol Craft, and was numbered "DF-378", but later on was re-designated as Patrol Gunboat "PG-378". Another round of reclassification was made in April 2016, which redesignated the patrol gunboat as the coastal patrol craft BRP Hilario Ruiz (PC-377).
The BRP Rafael Pargas (PC-379) is the ninth ship of the Jose Andrada class coastal patrol boats of the Philippine Navy. It is part of the second batch of its class ordered through US Foreign Military Sales (FMS) in 1993, and was commissioned with the Philippine Navy on 1 June 1995. It was initially designated as Fast Patrol Craft, and was numbered "DF-379", but later on was re-designated as a Patrol Gunboat, and was finally re-numbered as "PG-379". Another round of reclassification was made in April 2016, which redesignated the patrol gunboat as the coastal patrol craft "PC-379".
The BRP Dioscoro Papa (PC-381) is the eleventh ship of the Jose Andrada class coastal patrol boats of the Philippine Navy. It is part of the second batch of its class ordered through US Foreign Military Sales (FMS) in 1993, and was commissioned with the Philippine Navy on 1 June 1995.
The BRP Ismael Lomibao (PC-383) is the eleventh ship of the Jose Andrada class coastal patrol boats of the Philippine Navy. It is part of the second batch of its class ordered through US Foreign Military Sales (FMS) in 1993, and was commissioned with the Philippine Navy in 1995.
Šolta is a Mirna-class patrol boat in service with the Croatian Navy. Completed during the 1980s as Mukos (PČ-176), it was the sixth ship of a class that was being built for the Yugoslav Navy in the Kraljevica Shipyard.
BRP Filipino Flojo (PC-386) is the fifteenth ship of the Jose Andrada-class patrol craft coastal patrol craft of the Philippine Navy. It is part of the second batch of its class ordered through US Foreign Military Sales (FMS) in 1993, and was commissioned with the Philippine Navy on 22 May 1996. She is currently in active service with the Littoral Combat Force, Philippine Fleet.
The BRP Florencio Inigo (PC-393) is the twenty-first ship of the Jose Andrada class coastal patrol boats of the Philippine Navy. It is part of the Batch III of its class ordered through US Foreign Military Sales (FMS) in 1995, and was commissioned with the Philippine Navy in 1998.
The Cuban Revolutionary Navy is the navy of Cuba.
Poland 
