The United_States_Navy uses

hull classification symbols

to identify the types of its ships. See also pennant_number, a somewhat analogous system used by the Royal_Navy and some European navies. 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 being done to the physical ship. Many of these symbols are not presently in use.

Warships

Warships are designed to participate in combat operations.

Aircraft Carrier Type

All ships designed primarily for the purpose of conducting combat operations by aircraft which engage in attacks against airborne, surface, sub-surface and shore targets. The V is thought to originate from the French ''voler'', "to fly."
  • CV Multi-purpose Aircraft_Carrier
  • CVA Attack Aircraft_Carrier (retired)
  • CVB Large Aircraft_Carrier (category merged into CVA, 1952)
  • CVE Escort_aircraft_carrier (retired)
  • CVHE Escort Helicopter Aircraft Carrier (retired)
  • CVL Light Aircraft Carrier (retired)
  • CVN Multi-purpose Aircraft Carrier (Nuclear-Propulsion)
  • CVS Antisubmarine Aircraft Carrier (retired)

    Surface Combatant Type

    Large, heavily armed, surface ships which are designed primarily to engage enemy forces on the high seas.
  • ACR Armored_Cruiser (retired)
  • BB Battleship (originally just "B")
  • C Cruiser
  • CA (first series) Armored Cruiser (retired)
  • CA (second series) Heavy Cruiser, category later renamed Gun Cruiser (retired)
  • CAG Guided Missile Heavy Cruiser (retired)
  • CB Large Cruiser (retired)
  • CBC Large Command Cruiser (retired)
  • CC Battle Cruiser (retired)
  • CC (second usage) Command Cruiser (retired)
  • CG Guided Missile Cruiser
  • CGN Guided Missile Cruiser (Nuclear-Propulsion)
  • CL Light Cruiser (retired)
  • CLAA Antiaircraft Cruiser (retired)
  • CLG Guided Missile Light Cruiser (retired)
  • CLGN Guided Missile Light Cruiser (Nuclear-Propulsion) (retired)
  • CLK Hunter-Killer Cruiser (abolished 1951)
  • CS Scout Cruiser (retired)
  • CSGN Strike Cruiser
  • DD Destroyer
  • DDE Escort Destroyer (not to be confused with Destroyer Escort, DE - an Escort Destroyer, DDE, was a Destroyer, DD, converted for antisubmarine warfare) (category abolished 1962)
  • DDG Guided Missile Destroyer
  • DDK Hunter-Killer Destroyer (category merged into DDE, 4 March 1950)
  • DDR Radar Picket Destroyer (retired)
  • DE Destroyer_escort (abolished 30 June 1975)
  • DE Ocean Escort (abolished 30 June 1975)
  • DEG Guided Missile Ocean Escort (abolished 30 June 1975)
  • DER Radar Picket Destroyer_escort (abolished 30 June 1975) A word about the DE type symbol is in order here. There were two distinct breeds of DE, the World War II Destroyer_escorts (some of which were converted to DERs) and the postwar DE/DEG classes, which were known as Ocean Escorts despite carrying the same type symbol as the WWII Destroyer_escorts. All DEs, DEGs, and DERs were reclassified as FFs, FFGs, or FFRs, 30 June 1975.
  • DL Destroyer Leader (later Frigate) (retired)
  • DLG Guided Missile Frigate (abolished 30 June 1975)
  • DLGN Guided Missile Frigate (Nuclear-Propulsion) (abolished 30 June 1975) The DL category was established in 1951 with the abolition of the CLK category. CLK-1 became DL-1 and DD927-930 became DL2-5. By the mid-1950s the term Destroyer Leader had been dropped in favor of Frigate. DLGs and DLGNs were reclassified as CGs and CGNs, 30 June 1975. The old DLs were already gone by that time.
  • FF Frigate (retired)
  • FFG Guided Missile Frigate
  • FFR Radar Picket Frigate (retired)
  • FFT Frigate (Reserve Training) (retired) The FF, FFG, and FFR designations were established 30 June 1975 as new type symbols for ex-DEs, DEGs, and DERs.

    Submarine Type

    All self-propelled submersible types regardless of whether employed as combatant, auxiliary, or research and development vehicles which have at least a residual combat capability.
  • SC Cruiser Submarine
  • SF Fleet Submarine (retired)
  • SM Submarine Minelayer
  • SS Submarine
  • SSA Cargo Submarine
  • SSK Hunter-Killer Submarine (retired)
  • SSN Attack Submarine (Nuclear-Powered)
  • SSBN Ballistic Missile Submarine (Nuclear-Powered)
  • SSG Guided Missile Submarine (retired)
  • SSGN Guided Missile Submarine (Nuclear-Powered)
  • SSO Submarine Oiler (retired)
  • SSP Submarine Transport (retired)
  • SSR Radar Picket Submarine (retired)
  • SSRN Radar Picket Submarine (Nuclear-Powered) (retired)
  • SST Training Submarine There have been several other Submarine designations which did not begin with SS, included here for completeness:
  • AGSS Auxiliary Submarine
  • AOSS Submarine Oiler
  • ASSP Transport Submarine
  • APSS Transport Submarine
  • LPSS Amphibious Transport Submarine (Note: SSP, ASSP, APSS, and LPSS were all the same type, redesignated over the years.)
  • IXSS Unclassified Miscellaneous Submarine

    Patrol Combatant Type

    Combatants whose mission may extend beyond coastal duties and whose characteristics include adequate endurance and sea keeping providing a capability for operations exceeding 48 hours on the high seas without support.
  • PG Gunboat, later Patrol_Combatant
  • PHM Patrol, Hydrofoil Missile

    Amphibious Warfare Type

    All ships having organic capability for amphibious assault and which have characteristics enabling long duration operations on the high seas.
  • LHA Amphibious_Assault_Ship (General Purpose)
  • LHD Amphibious_Assault_Ship (Multi-Purpose)
  • LPD Amphibious Transport_Dock
  • LPH Amphibious Assault Ship (Helicopter)
  • LKA Amphibious Cargo Ship
  • LSD Dock_Landing_Ship
  • LSM Medium Landing_Ship
  • LST Tank_Landing_Ship
  • LCC Amphibious_Command_Ship

    Combat Logistics Type

    Ships which have the capability to provide underway replenishment to fleet units.
  • AC Collier
  • AE Ammunition_Ship
  • AFS Combat_Store_Ship
  • AO Fleet Oiler
  • AOE Fast_Combat_Support_Ship
  • AOR Replenishment_Oiler

    Mine Warfare Type

    All ships whose primary function is mine warfare on the high seas.
  • AM Minesweeper
  • AMb Harbor Minesweeper
  • AMc Coastal Minesweeper
  • MSO Minesweeper - Ocean
  • MCM Mine_Countermeasures_Ship
  • MCS Mine_Countermeasures_Support_Ship
  • MHC Minehunter, Coastal
  • CM Minelayer
  • CMc Coastal Minelayer

    Coastal Defense Type

    All ships whose primary function is coastal patrol and interdiction.
  • PC Patrol, Coastal
  • PCE Patrol Escort

    Mobile Logistics Type

    Ships which have the capability to provide direct material support to other deployed units operating far from home base.
  • AD Destroyer_Tender
  • AR Repair_Ship
  • AS Submarine_Tender

    Support Ships

    Support ships are not designed to participate in combat, and are generally not armed.

    Support Type

    A grouping of ships designed to operate in the open ocean in a variety of sea states to provide general support to either combatant forces or shore based establishments. (Includes smaller auxiliaries which by the nature of their duties, leave inshore waters).
  • ARS Salvage_Ship
  • ASR Submarine_Rescue_Ship
  • ATA Auxiliary Ocean_Tug
  • ATF Fleet Ocean_Tug
  • ATS Salvage_and_Rescue_Ship
  • ACS Auxiliary Crane_Ship
  • AG Miscellaneous Auxiliary
  • AGDS Deep Submergence Support Ship
  • AGER Environmental_Research_Ship
  • AGF Miscellaneous Command_Ship
  • AGM Missile_Range_Instrumentation_Ship
  • AGOR Oceanographic_Research_Ship
  • AGOS Ocean_Surveillance_Ship
  • AGS Surveying_Ship
  • AGSS Auxiliary Research Submarine
  • AH Hospital_Ship
  • AK Cargo_Ship
  • AKR Vehicle Cargo_Ship
  • AOG Gasoline_Tanker
  • AOT Transport_Oiler
  • AP Transport
  • APD High Speed Transport
  • ARC Cable_Repair_Ship
  • AVB Aviation Logistics Support Ship
  • AVT Auxiliary Aircraft Landing Training Ship

    Service Type Craft

    A grouping of navy-subordinated craft (including non-self-propelled) designed to provide general support to either combatant forces or shore-based establishments.
  • AB Crane Ship
  • AFDB Large Auxiliary_Floating_Dry_Dock
  • AFDL Small Auxiliary_Floating_Dry_Dock
  • AFDM Medium Auxiliary_Floating_Dry_Dock
  • ARD Auxiliary Repair Dry Dock
  • ARDM Medium Auxiliary Repair Dry Dock
  • YFD Yard Floating Dry Dock
  • YTB Large Harbor_Tug
  • YTL Small Harbor_Tug
  • YTM Medium Harbor_Tug
  • YO Fuel Oil Barge
  • YOG Gasoline Barge
  • YW Water Barge
  • YF Covered_Lighter
  • YFR Refrigerated Cover Lighter
  • YFU Harbor Utility Craft
  • YG Garbage Lighter
  • YC Open_Lighter
  • YCF Car_Float
  • YCV]Aircraft Transportation Lighter
  • YFN Covered Lighter
  • YFNB]Large Covered Lighter
  • YFNX Lighter (Special purpose)
  • YFRN Refrigerated Covered Lighter
  • YFRT Range_Tender
  • YGN Garbage Lighter
  • YOGN Gasoline Barge
  • YON Fuel Oil Barge
  • YOS Oil Storage Barge
  • YSR Sludge Removal Barge
  • YWN Water Barge
  • DSRV Deep_Submergence_Rescue_Vehicle
  • DSV Deep Submergence Vehicle
  • NR Submersible Research Vehicle
  • YFB Ferry_Boat or Launch
  • YM Dredge
  • YP Patrol Craft, Training
  • YSD Seaplane Wrecking Derrick
  • YTT Torpedo Trials Craft
  • APL Barracks Craft
  • YD Floating Crane
  • YDT Diving Tender
  • YFND Dry Dock Companion Craft
  • YFP Floating Power Barge
  • YLC Salvage Lift Craft
  • YMN Dredge
  • YNG Gate_Craft
  • YPD Floating Pile Driver
  • YR Floating Workshop
  • YRB Repair and Berthing Barge
  • YRBM Repair, Berthing and Messing Barge
  • YRDH Floating Dry Dock Workshop (Hull)
  • YRDM Floating Dry Dock Workshop (Machine)
  • YRR Radiological Repair Barge
  • YRST Salvage Craft Tender
  • IX Unclassified Miscellaneous Unit
  • X Submersible Craft The USS ''Constitution'', formerly IX 21, was reclassified to none, effective September_1, 1975.
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