This is a list of mine warfare vessels of the United States Navy.
Ship status is indicated as either currently active [A] (including ready reserve), inactive [I], or precommissioning [P].
Mine warfare ships were originally considered by the US Navy to be either auxiliaries or yard and district craft, and so were given hull classification symbols beginning with either 'A' or 'Y', depending on their capabilities.
The exceptions were four converted cargo ships with ID numbers (prior to the modern hull system), certain large 'cruiser' minelayers which were given hull symbols beginning with 'CM', converted destroyers which were given hull symbols beginning with 'DM', and three unclassified civilian cargo ships after World War II.
Modern Littoral Combat Ships use 'L' hull symbols even though they can be used for mine warfare.
Other/unknown classes On 7 February 1955, all AMCU's were redesignated as Coastal minehunters (MHC).
Another Liberty ship, the SS R. Ney McNeely, was also converted into an experimental minesweeper, but was returned to the reserve fleet without having a YAG number assigned.
[22] Mineplanters were used to plant and maintain controlled mines for harbor defense; since the US Army had the primary responsibility for these minefields it is likely that the YMP hull designation was seldom used.
After the end of World War II three war-damaged civilian ships with skeleton Navy crews and automated engineering spaces were used as minesweepers to trigger still-active US pressure mines in Japanese waters.