An aircraft carrier is a warship that serves as a seagoing airbase, equipped with a full-length flight deck and facilities for carrying, arming, deploying, and recovering aircraft. Typically, it is the capital ship of a fleet, as it allows a naval force to project air power worldwide without depending on local bases for staging aircraft operations.
The battlecruiser, or battle cruiser, was a type of capital ship of the first half of the 20th century. They were similar in size, cost, and armament to battleships, but they generally carried less armour in order to attain faster speeds.
Some variations on the Treaty cruiser design included the German Deutschland-class "pocket battleships" which had heavier armament at the expense of speed compared to standard heavy cruisers, and the American Alaska class, which was a scaled-up heavy cruiser design designated as a "cruiser-killer".
The first of its kind, the Royal Navy's Dreadnought made such a strong impression on people's minds when launched in 1906 that similar battleships built subsequently were referred to generically as "dreadnoughts", and earlier battleships became known as "pre-dreadnoughts".
Frigate (FFG): There are only 22 frigates left in the Oliver Hazard Perry Class, with these ships intended to be replaced by the new LCS's. Frigates were designed mainly as a cost effective and relatively inexpensive escort platform that could protect merchants convoys, supply ships, as well as expeditionary and amphibious forces.
Initially called "Gunboat No. 1", Von der Tann was the most modern ship in the navy. She participated successfully in the First Schleswig War of 1848–1851. Britain built a large number of wooden screw-gunboats during the 1850s, some of which participated in the Crimean War (1853–1856), Second Opium War (1856–1860) and Indian Mutiny (1857–1859).
The proliferation of ironclad battleship designs came to an end in the 1890s as navies reached a consensus on the design of battleships, producing the type known as the pre-Dreadnought. These ships are sometimes covered in treatments of the ironclad warship.
Mine planter and the earlier "torpedo planter" was a term used for mine warfare ships into the early days of World War I. In later terminology, particularly in the United States, a mine planter was a ship specifically designed to install controlled mines or contact mines in coastal fortifications.
These "river battleships", as they were known by the men, operated in conjunction with the CCB (Command Control Boat—also a monitor), ATCs (Armored Transport Carriers), and the ASPBs (Assault Support Patrol Boats) which were also assigned to each RAD.
Harbour security boat (PBI) – 4 newly built 80 ton class harbour security / patrol boats, and more are planned in order to take over the port security / patrol duties currently performed by the obsolete Shantou, Beihai, Huangpu, and Yulin classes gunboats, which are increasingly being converted to inshore surveying boats and range support boats.
Q-ships, also known as Q-boats, decoy vessels, special service ships, or mystery ships, were heavily armed merchant ships with concealed weaponry, designed to lure submarines into making surface attacks. This gave Q-ships the chance to open fire and sink them. They were used by the British Royal Navy and the German Kaiserliche Marine during the First World War and by the RN, the Kriegsmarine and the United States Navy during the Second World War.
A troopship (also troop ship or troop transport or trooper) is a ship used to carry soldiers, either in peacetime or wartime. Operationally, standard troopships – often drafted from commercial shipping fleets – cannot land troops directly on shore, typically loading and unloading at a seaport or onto smaller vessels, either tenders or barges.