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United States ship naming conventions for the U.S. Navy were established by congressional action at least as early as 1862. Title 13, section 1531, of the U.S. Code , enacted in that year, reads, in part,
The combination of symbol and hull number identify a modern Navy ship uniquely. A heavily modified or repurposed ship may receive a new symbol, and either retain the hull number or receive a new one. Also, the system of symbols has changed a number of times since it was introduced in 1907, so ships' symbols sometimes change without anything ...
If a U.S. Navy ship's hull classification symbol begins with "T-", it is part of the Military Sealift Command, has a primarily civilian crew, and is a United States Naval Ship (USNS) in non-commissioned service – as opposed to a commissioned United States Ship (USS) with an all-military crew.
A United States Navy ship that is not in active commission does not hold the title of United States Ship with simply the name without prefix used before and after commissioned service. [5] Vessels, such as yard and harbor craft that are not commissioned and "in service" are officially referred to by name or hull number without prefix. [ 5 ]
The U.S. Navy has operated a number of vessels important to both United States and world naval history: USS Constitution, nicknamed "Old Ironsides", is the only surviving vessel of the original six frigates authorized by Congress in the Naval Act of 1794, which established the United States Navy.
In instances where a ship was captured or otherwise acquired by a navy or shipping company, or simply renamed, and the article is placed at that title, use the date that is in agreement with the name and prefix (such as the date of capture or entry to the navy or fleet, or the date of the renaming) rather than the date of launch.
The Hydrographic Office was established "for the improvement of the means for navigating safely the vessels of the Navy and of the mercantile marine, by providing, under the authority of the Secretary of the Navy, accurate and cheap nautical charts, sailing directions, navigators and manuals of instructions for the use of all vessels of the ...
Naval Registry Identification Number – United States until 1920s, replaced by hull classification symbol system IMO number – a unique identifier issued by the International Maritime Organization (IMO) for ships