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This is a list of auxiliaries of the United States Navy. It covers the various types of ships that support the frontline combat vessels of the United States Navy. Auxiliary ships which function as hospital ships and as oilers are to be found in their own articles: List of United States Navy hospital ships and List of United States Navy oilers. Escort carriers, amphibious warfare vessels, and some mine warfare vessels were also originally classed as auxiliaries but were later given their own hull classification symbols outside the auxiliary series (which all begin with an 'A'). Links to these and other list articles of similar ships can be found throughout this article. Yard and district craft also function as auxiliaries but generally are smaller and less capable than their ocean going counterparts, and so they generally remain in harbors and coastal areas. Their hull classification symbols begin with a 'Y'. Ship status is indicated as either currently active [A], ready reserve [R], inactive [I], or precommissioning [P]. Ships in the inactive category include only ships in the inactive reserve, ships which have been disposed from US service have no listed status. Ships in the precommissioning category include ships under construction or on order. Listed ship classes will often state 'MA type' or 'MC type'. The difference is that 'MC Type' refers to ships designed by the United States Maritime Commission aka MarCom, while 'MA Type' refers to ships designed or converted under MarCom's successor agency, the United States Maritime Administration or MarAd. They are in fact the same designs, and the year 1950 is the date at which MarAd succeeded MarCom.

Prior to the creation of the auxiliary hull classification system, ships that performed such tasks had no symbol or code to identify them, only informal designations such as Fleet Collier No. 1.

During World War I the Navy created the Section patrol (SP) and identification number (ID) system to register civilian vessels for naval acquisition. The ID series can be considered a forerunner of the current auxiliary hull numbering system, and some ships with ID numbers were later given 'A' hull symbols. Also during WWI a series of mass produced ships were designed by the Emergency Fleet Corporation, but few were completed before the end of the war and even fewer became naval auxiliaries.

All YFDs were reclassified as AFDMs in 1945.

APM was the original hull designation of what became the Landing Ship, Dock (LSD).

APR was the original hull symbol intended for the patrol craft escorts that were converted to rescue crews from ships attacked in convoys, but they were instead redesignated as PCERs.

The Auxiliary aircraft escort vessels (AVG) were redesignated Auxiliary aircraft carriers (ACV) on 20 August 1942 and then Escort aircraft carriers (CVE) on 15 July 1943.

Civilian cargo ships, tankers, transports, etc., were registered during World War I for potential use and given "ID" identification numbers in the "ID/SP" numbering series.