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.
A ship class is a group of ships of a similar design. This is distinct from a ship type, which might reflect a similarity of tonnage or intended use. For example, USS Carl Vinson is a nuclear aircraft carrier of the Nimitz class.
The Royal Danish Navy is the sea-based branch of the Danish Defence force. The RDN is mainly responsible for maritime defence and maintaining the sovereignty of Danish territorial waters. Other tasks include surveillance, search and rescue, icebreaking, oil spill recovery and prevention as well as contributions to international tasks and forces.
A ship's tender, usually referred to as a tender, is a boat, or a larger ship, used to service or support other boats or ships. This is generally done by transporting people or supplies to and from shore or another ship. Smaller boats may also have tenders, usually called dinghies.
A seaplane tender is a boat or ship that supports the operation of seaplanes. Some of these vessels, the seaplane carriers, could not only carry seaplanes but also provided all the facilities needed for their operation; these ships are regarded by some as the first aircraft carriers and appeared just before the First World War.
A submarine tender is a type of depot ship that supplies and supports submarines.
The third USS Proteus (AS-19) was a Fulton-class submarine tender in the United States Navy.
The G- and H-class destroyers were a group of 18 destroyers built for the Royal Navy during the 1930s. Six additional ships being built for the Brazilian Navy when World War II began in 1939 were purchased by the British and named the Havant class. The design was a major export success with other ships built for the Argentine and Royal Hellenic Navies. They were assigned to the Mediterranean Fleet upon completion and enforced the Non-Intervention Agreement during the Spanish Civil War of 1936–39.
An auxiliary ship is a naval ship designed to operate in support of combatant ships and other naval operations. Auxiliaries are not primary combatants, although they may have some limited combat capacity, usually of a self-defence nature.
The Archer class is a class of patrol and training vessel in service with the United Kingdom's Royal Navy, commonly referred to as a Fast Training Boat. Most are assigned to University Royal Naval Units, although HMS Tracker and HMS Raider are armed and provide maritime force protection to high value shipping in the Firth of Clyde and are most commonly employed as escorts for submarines transiting to Faslane. Pursuer and Dasher are also armed and provide maritime force protection operating with the Gibraltar Squadron.
HMS Explorer is an Archer-class P2000-type patrol and training vessel of the British Royal Navy. The ship is primarily assigned to the Yorkshire Universities Royal Naval Unit (URNU), serving the universities of Hull, Sheffield and Leeds. The ship is based in Kingston-Upon-Hull and mainly operates on the East coast of the UK, particularly in and around the river Humber.
USS Beaver (AS-5) was a submarine tender which served in the United States Navy from 1918 to 1946.
Service Force, United States Pacific Fleet, usually known as COMSERVPAC, was a service support command of the United States Pacific Fleet from 1942 until 1973. It was the reincarnation of the former Base Force. The Service Force comprised the supply train of the fleet which includes Oilers (AO), Gasoline Tanker (AOG), Repair Ships (AR), Ammunition Ships (AE), Destroyer Tenders (AD) and Submarine tenders (AS).
SMS Mecklenburg was the fifth ship of the Wittelsbach class of pre-dreadnought battleships of the German Imperial Navy. Laid down in May 1900 at the AG Vulcan shipyard in Stettin, Germany, she was finished in May 1903. Her sister ships were Wittelsbach, Zähringen, Wettin, and Schwaben; they were the first capital ships built under the Navy Law of 1898, championed by Admiral Alfred von Tirpitz. Mecklenburg was armed with a main battery of four 24-centimeter (9.4 in) guns and had a top speed of 18 knots.
SMS Schwaben was the fourth ship of the Wittelsbach class of pre-dreadnought battleships of the German Imperial Navy. Schwaben was built at the Imperial Dockyard in Wilhelmshaven. She was laid down in 1900, and completed in April 1904. Her sister ships were Wittelsbach, Zähringen, Wettin and Mecklenburg; they were the first capital ships built under the Navy Law of 1898, championed by Admiral Alfred von Tirpitz. Schwaben was armed with a main battery of four 24-centimeter (9.4 in) guns and had a top speed of 18 knots.
The 1. Ubootgeschwader is a submarine squadron of the German Navy. It is based at Eckernförde, Schleswig-Holstein, and forms part of Einsatzflottille 1, headquartered in Kiel.
Elbe (A511) is the lead ship of the Elbe-class replenishment ships of the German Navy.
Rhein (A513) is the third ship of the Elbe-class replenishment ships of the German Navy.
Werra (A514) is the fourth ship of the Elbe-class replenishment ships of the German Navy.
Main (A515) is the fifth ship of the Elbe-class replenishment ships of the German Navy.
German Navy 
