Hull classification symbol

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The United States Navy, United States Coast Guard, and United States National Oceanic and Atmospheric Administration (NOAA) use a hull classification symbol (sometimes called hull code or hull number ) to identify their ships by type and by individual ship within a type. The system is analogous to the pennant number system that the Royal Navy and other European and Commonwealth navies use.



United States Navy

The U.S. Navy began to assign unique Naval Registry Identification Numbers to its ships in the 1890s. The system was a simple one in which each ship received a number which was appended to its ship type, fully spelled out, and added parenthetically after the ship's name when deemed necessary to avoid confusion between ships. Under this system, for example, the battleship Indiana was USS Indiana (Battleship No. 1), the cruiser Olympia was USS Olympia (Cruiser No. 6), and so on. Beginning in 1907, some ships also were referred to alternatively by single-letter or three-letter codes—for example, USS Indiana (Battleship No. 1) could be referred to as USS Indiana (B-1) and USS Olympia (Cruiser No. 6) could also be referred to as USS Olympia (C-6), while USS Pennsylvania (Armored Cruiser No. 4) could be referred to as USS Pennsylvania (ACR-4). However, rather than replacing it, these codes coexisted and were used interchangeably with the older system until the modern system was instituted on 17 July 1920. [1]

During World War I, the U.S. Navy acquired large numbers of privately owned and commercial ships and craft for use as patrol vessels, mine warfare vessels, and various types of naval auxiliary ships, some of them with identical names. To keep track of them all, the Navy assigned unique identifying numbers to them. Those deemed appropriate for patrol work received section patrol numbers (SP), while those intended for other purposes received "identification numbers", generally abbreviated "Id. No." or "ID;" some ships and craft changed from an SP to an ID number or vice versa during their careers, without their unique numbers themselves changing, and some ships and craft assigned numbers in anticipation of naval service were never acquired by the Navy. The SP/ID numbering sequence was unified and continuous, with no SP number repeated in the ID series or vice versa so that there could not be, for example, both an "SP-435" and an "Id. No. 435". The SP and ID numbers were used parenthetically after each boat's or ship's name to identify it; although this system pre-dated the modern hull classification system and its numbers were not referred to at the time as "hull codes" or "hull numbers," it was used in a similar manner to today's system and can be considered its precursor. [2]

United States Revenue Cutter Service and United States Coast Guard

The United States Revenue Cutter Service, which merged with the United States Lifesaving Service in January 1915 to form the modern United States Coast Guard, began following the Navy's lead in the 1890s, with its cutters having parenthetical numbers called Naval Registry Identification Numbers following their names, such as (Cutter No. 1), etc. This persisted until the Navy's modern hull classification system's introduction in 1920, which included Coast Guard ships and craft.

United States Coast and Geodetic Survey

Like the U.S. Navy, the United States Coast and Geodetic Survey – a uniformed seagoing service of the United States Government and a predecessor of the National Oceanic and Atmospheric Administration (NOAA) – adopted a hull number system for its fleet in the 20th century. Its largest vessels, "Category I" oceanographic survey ships, were classified as "ocean survey ships" and given the designation "OSS". Intermediate-sized "Category II" oceanographic survey ships received the designation "MSS" for "medium survey ship," and smaller "Category III" oceanographic survey ships were given the classification "CSS" for "coastal survey ship." A fourth designation, "ASV" for "auxiliary survey vessel," included even smaller vessels. In each case, a particular ship received a unique designation based on its classification and a unique hull number separated by a space rather than a hyphen; for example, the third Coast and Geodetic Survey ship named Pioneer was an ocean survey ship officially known as USC&GS Pioneer (OSS 31). [3] [4] The Coast and Geodetic Survey's system persisted after the creation of NOAA in 1970, when NOAA took control of the Survey's fleet, but NOAA later changed to its modern hull classification system.

United States Fish and Wildlife Service

The Fish and Wildlife Service, created in 1940 and reorganized as the United States Fish and Wildlife Service (USFWS) in 1956, adopted a hull number system for its fisheries research ships and patrol vessels. It consisted of "FWS" followed by a unique identifying number. In 1970, NOAA took control of the seagoing ships of the USFWS′s Bureau of Commercial Fisheries, and as part of the NOAA fleet they eventually were renumbered under the NOAA hull number system.

The modern hull classification system

United States Navy

The U.S. Navy instituted its modern hull classification system on 17 July 1920, doing away with section patrol numbers, "identification numbers", and the other numbering systems described above. In the new system, all hull classification symbols are at least two letters; for basic types the symbol is the first letter of the type name, doubled, except for aircraft carriers.

The combination of symbol and hull number identifies a modern Navy ship uniquely. A heavily modified or re-purposed ship may receive a new symbol, and either retain the hull number or receive a new one. For example, the heavy gun cruiser USS Boston (CA-69) was converted to a gun/missile cruiser, changing the hull number to CAG-1. Also, the system of symbols has changed a number of times both since it was introduced in 1907 and since the modern system was instituted in 1920, so ships' symbols sometimes change without anything being done to the physical ship. [5]

Hull numbers are assigned by classification. Duplication between, but not within, classifications is permitted. Hence, CV-1 was the aircraft carrier USS Langley and BB-1 was the battleship USS Indiana.

Ship types and classifications have come and gone over the years, and many of the symbols listed below are not presently in use. The Naval Vessel Register maintains an online database of U.S. Navy ships showing which symbols are presently in use.

After World War II until 1975, the U.S. Navy defined a "frigate" as a type of surface warship larger than a destroyer and smaller than a cruiser. In other navies, such a ship generally was referred to as a "flotilla leader", or "destroyer leader". Hence the U.S. Navy's use of "DL" for "frigate" prior to 1975, while "frigates" in other navies were smaller than destroyers and more like what the U.S. Navy termed a "destroyer escort", "ocean escort", or "DE". The United States Navy 1975 ship reclassification of cruisers, frigates, and ocean escorts brought U.S. Navy classifications into line with other nations' classifications, at least cosmetically in terms of terminology, and eliminated the perceived "cruiser gap" with the Soviet Navy by redesignating the former "frigates" as "cruisers".

Military Sealift Command

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.

United States Coast Guard

If a ship's hull classification symbol begins with "W", it is a commissioned cutter of the United States Coast Guard. Until 1965, the Coast Guard used U.S. Navy hull classification codes, prepending a "W" to their beginning. In 1965, it retired some of the less mission-appropriate Navy-based classifications and developed new ones of its own, most notably WHEC for "high endurance cutter" and WMEC for "medium endurance cutter".

National Oceanic and Atmospheric Administration

The National Oceanic and Atmospheric Administration (NOAA), a component of the United States Department of Commerce, includes the National Oceanic and Atmospheric Administration Commissioned Officer Corps (or "NOAA Corps"), one of the eight uniformed services of the United States, and operates a fleet of seagoing research and survey ships. The NOAA fleet also uses a hull classification symbol system, which it also calls "hull numbers," for its ships.

After NOAA took over the former fleets of the U.S. Coast and Geodetic Survey and the U.S. Fish and Wildlife Service Bureau of Commercial Fisheries in 1970, it adopted a new system of ship classification. In its system, the NOAA fleet is divided into two broad categories, research ships and survey ships. The research ships, which include oceanographic and fisheries research vessels, are given hull numbers beginning with "R", while the survey ships, generally hydrographic survey vessels, receive hull numbers beginning with "S". The letter is followed by a three-digit number; the first digit indicates the NOAA "class" (i.e., size) of the vessel, which NOAA assigns based on the ship's gross tonnage and horsepower, while the next two digits combine with the first digit to create a unique three-digit identifying number for the ship.

Generally, each NOAA hull number is written with a space between the letter and the three-digit number, as in, for example, NOAAS Nancy Foster (R 352) or NOAAS Thomas Jefferson (S 222). [6]

Unlike in the U.S. Navy system, once an older NOAA ship leaves service, a newer one can be given the same hull number; for example, "S 222" was assigned to NOAAS Mount Mitchell (S 222), then assigned to NOAAS Thomas Jefferson (S 222), which entered NOAA service after Mount Mitchell was stricken.

United States Navy hull classification codes

The U.S. Navy's system of alpha-numeric ship designators, and its associated hull numbers, have been for several decades a unique method of categorizing ships of all types: combatants, auxiliaries and district craft. Though considerably changed in detail and expanded over the years, this system remains essentially the same as when formally implemented in 1920. It is a very useful tool for organizing and keeping track of naval vessels, and also provides the basis for the identification numbers painted on the bows (and frequently the sterns) of most U.S. Navy ships.

The ship designator and hull number system's roots extend back to the late 1880s when ship type serial numbers were assigned to most of the new-construction warships of the emerging "Steel Navy". During the course of the next thirty years, these same numbers were combined with filing codes used by the Navy's clerks to create an informal version of the system that was put in place in 1920. Limited usage of ship numbers goes back even earlier, most notably to the "Jeffersonian Gunboats" of the early 1800s and the "Tinclad" river gunboats of the Civil War Mississippi Squadron.

It is important to understand that hull number-letter prefixes are not acronyms, and should not be carelessly treated as abbreviations of ship type classifications. Thus, "DD" does not stand for anything more than "Destroyer". "SS" simply means "Submarine". And "FF" is the post-1975 type code for "Frigate." [7]

The hull classification codes for ships in active duty in the United States Navy are governed under Secretary of the Navy Instruction 5030.8B (SECNAVINST 5030.8B).


Warships are designed to participate in combat operations.

The origin of the two-letter code derives from the need to distinguish various cruiser subtypes. [1]

BattleshipHeavy gun-armed vessel (–1962)BB
Cruiserarmored (1921–1931)
heavy (1931–1975)
large (–1947)CB
light (–1950)CL
aviation or volerCV

Aircraft carrier type

Aircraft carriers are ships designed primarily for the purpose of conducting combat operations by aircraft which engage in attacks against airborne, surface, sub-surface and shore targets. Contrary to popular belief, the "CV" hull classification symbol does not stand for "carrier vessel". "CV" derives from the cruiser designation, with one popular theory that the v comes from French voler, "to fly", but this has never been definitively proven. [8] [9] Aircraft carriers are designated in two sequences: the first sequence runs from CV-1 USS Langley to the very latest ships, and the second sequence, "CVE" for escort carriers, ran from CVE-1 Long Island to CVE-127 Okinawa before being discontinued.

Surface combatant type

Surface combatants are ships which are designed primarily to engage enemy forces on the high seas. The primary surface combatants are battleships, cruisers and destroyers. Battleships are very heavily armed and armored; cruisers moderately so; destroyers and smaller warships, less so. Before 1920, ships were called "<type> no. X", with the type fully pronounced. The types were commonly abbreviated in ship lists to "B-X", "C-X", "D-X" et cetera—for example, before 1920, USS Minnesota (BB-22) would have been called "USS Minnesota, Battleship number 22" orally and "USS Minnesota, B-22" in writing. After 1920, the ship's name would have been both written and pronounced "USS Minnesota (BB-22)". In generally decreasing size, the types are:

  • ACR: Armored Cruiser (pre-1920)
  • AFSB: Afloat forward staging base (also AFSB(I) for "interim", changed to ESB for Expeditionary Mobile Dock)
  • B: Battleship (pre-1920)
  • BB: Battleship
  • BBG: Battleship, guided missile or arsenal ship (theoretical only, never assigned) [A 1]
  • BM: Monitor (1920–retirement)
  • C: Cruiser (pre-1920 protected cruisers and peace cruisers)
  • CA: (first series) Cruiser, armored (retired, comprised all surviving pre-1920 armored and protected cruisers)
  • CA: (second series) Heavy cruiser, category later renamed gun cruiser (retired)
  • CAG: Cruiser, heavy, guided missile (retired)
  • CB: Large cruiser (retired)
  • CBC: Large command cruiser (retired, never used operationally) [A 2]
  • CC: Battlecruiser (retired, never used operationally) [A 3]
  • CC: (second usage) command ship (retired) [A 4]
  • CLC: Command cruiser [A 4]
  • CLD: Cruiser-destroyer, light (never used operationally)
  • CG: Cruiser, guided missile
  • CGN: Cruiser, guided missile, nuclear-powered: USS Long Beach (CGN-9) and USS Bainbridge (CGN-25)
  • CL: Cruiser, light (retired)
  • CLAA: Cruiser, light, anti-aircraft (retired)
  • CLG: Cruiser, light, guided missile (retired)
  • CLGN: Cruiser, light, guided missile, nuclear-powered (retired)
  • CLK: Cruiser, hunter–killer (abolished 1951) [A 5]
  • CM: Cruiser–minelayer (retired)
  • CS: Scout cruiser (retired)
  • CSGN: Cruiser, strike, guided missile, nuclear-powered (retired, never used operationally)
  • D: Destroyer (pre-1920)
  • DD: Destroyer
  • DDC: Corvette (briefly proposed in the mid-1950s) [14]
  • DDE: Escort destroyer, a destroyer (DD) converted for antisubmarine warfare – category abolished 1962. (not to be confused with destroyer escort DE)
  • DDG: Destroyer, guided missile
  • DDK: Hunter–killer destroyer (category merged into DDE, 4 March 1950)
  • DDR: Destroyer, radar picket (retired)
  • DE: Destroyer escort (World War II, later became Ocean escort)
  • 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) 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 World War II destroyer escorts. All DEs, DEGs, and DERs were reclassified as FFs, FFGs, or FFRs, 30 June 1975.
  • DL: Destroyer leader (later frigate) (retired) [A 5]
  • DLG: Frigate, guided missile (abolished 30 June 1975)
  • DLGN: Frigate, guided missile, 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 DD 927–930 became DL 2–5. By the mid-1950s the term destroyer leader had been dropped in favor of frigate. Most DLGs and DLGNs were reclassified as CGs and CGNs, 30 June 1975. However, DLG 6–15 became DDG 37–46. The old DLs were already gone by that time. Only applied to USS Bainbridge (DLGN-25).
  • DM: Destroyer, minelayer (retired)
  • DMS: Destroyer, minesweeper (retired)
  • FF: Frigate
  • PF: Patrol frigate (retired)
  • FFG: Frigate, guided missile
  • FFH: Frigate with assigned helicopter [15]
  • FFL: Frigate, light
  • FFR: Frigate, radar picket (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. The first new-built ships to carry the FF/FFG designation were the Oliver Hazard Perry-class frigates. In January 2015, it was announced that the LCS ship types would be redesignated as FF.
  • PG: Patrol gunboat (retired)
  • PCH: Patrol craft, hydrofoil (retired)
  • PHM: Patrol, hydrofoil, missile (retired)
  • K: Corvette (retired)
  • LCS: Littoral combat ship In January 2015, the Navy announced that the up-gunned LCS will be reclassified as a frigate, since the requirements of the SSC Task Force was to upgrade the ships with frigate-like capabilities. Hull designations will be changed from LCS to FF; existing LCSs back-fitted with modifications may also earn the FF label. [16] The Navy is hoping to start retrofitting technological upgrades onto existing and under construction LCSs before 2019. [17]
  • LSES: Large Surface Effect Ship
  • M: Monitor (1880s–1920)
  • SES: Surface Effect Ship
  • TB: Torpedo boat

Submarine type

Submarines are all self-propelled submersible types (usually started with SS) regardless of whether employed as combatant, auxiliary, or research and development vehicles which have at least a residual combat capability. While some classes, including all diesel-electric submarines, are retired from USN service, non-U.S. navies continue to employ SS, SSA, SSAN, SSB, SSC, SSG, SSM, and SST types. [18] With the advent of new Air Independent Propulsion/Power (AIP) systems, both SSI and SSP are used to distinguish the types within the USN, but SSP has been declared the preferred term. SSK, retired by the USN, continues to be used colloquially and interchangeably with SS for diesel-electric attack/patrol submarines within the USN, and, more formally, by the Royal Navy and British firms such as Jane's Information Group.

  • SC: Cruiser Submarine (retired)
  • SF: Fleet Submarine (retired)
  • SM: Submarine Minelayer (retired)
  • SS: Submarine, Attack Submarine [19]
  • SSA: Submarine Auxiliary, Auxiliary/Cargo Submarine
  • SSAN: Submarine Auxiliary Nuclear, Auxiliary/Cargo Submarine, Nuclear-powered
  • SSB: Submarine Ballistic, Ballistic Missile Submarine
  • SSBN: Submarine Ballistic Nuclear, Ballistic Missile Submarine, Nuclear-powered
  • SSC: Coastal Submarine, over 150 tons
  • SSG: Guided Missile Submarine
  • SSGN: Guided Missile Submarine, Nuclear-powered
  • SSI: Attack Submarine (Diesel Air-Independent Propulsion) [20]
  • SSK: Hunter-Killer/ASW Submarine (retired) [21]
  • SSKN: Hunter-Killer/ASW Submarine, Nuclear-powered (retired)
  • SSM: Midget Submarine, under 150 tons
  • SSN: Attack Submarine, Nuclear-powered
  • SSNR: Special Attack Submarine [note 1]
  • SSO: Submarine Oiler (retired)
  • SSP: Attack Submarine (Diesel Air-Independent Power) (alternate use), formerly Submarine Transport
  • SSQ: Auxiliary Submarine, Communications (retired)
  • SSQN: Auxiliary Submarine, Communications, Nuclear-powered (retired) [22]
  • SSR: Radar Picket Submarine (retired)
  • SSRN: Radar Picket Submarine, Nuclear-powered (retired)
  • SST: Training Submarine
  • AGSS: Auxiliary Submarine
  • AOSS: Submarine Oiler (retired)
  • ASSP: Transport Submarine (retired)
  • APSS: Transport Submarine (retired)
  • LPSS: Amphibious Transport Submarine (retired)
  • SSLP: Transport Submarine (retired)
SSP, ASSP, APSS, and LPSS were all the same type, redesignated over the years.
  • IXSS: Unclassified Miscellaneous Submarine
  • MTS: Moored Training Ship (Naval Nuclear Power School Training Platform; reconditioned SSBNs and SSNs)

Patrol combatant type

Patrol combatants are ships whose mission may extend beyond coastal duties and whose characteristics include adequate endurance and seakeeping, providing a capability for operations exceeding 48 hours on the high seas without support. This notably included Brown Water Navy/Riverine Forces during the Vietnam War. Few of these ships are in service today.

Amphibious warfare type

Amphibious warfare vessels include all ships having an organic capability for amphibious warfare and which have characteristics enabling long duration operations on the high seas. There are two classifications of craft: amphibious warfare ships which are built to cross oceans, and landing craft, which are designed to take troops from ship to shore in an invasion.

The US Navy hull classification symbol for a ship with a well deck depends on its facilities for aircraft:


Landing Craft

Expeditionary support

Operated by Military Sealift Command, have ship prefix "USNS", hull code begins with "T-".

Combat logistics type

Ships which have the capability to provide underway replenishment to fleet units.

Mine warfare type

Mine warfare ships are those ships whose primary function is mine warfare on the high seas.

Coastal defense type

Coastal defense ships are those whose primary function is coastal patrol and interdiction.

Mobile logistics type

Mobile logistics ships have the capability to provide direct material support to other deployed units operating far from home ports.

Auxiliary type

An auxiliary ship is designed to operate in any number of roles supporting combatant ships and other naval operations.


Although technically an aircraft, pre-World War II rigid airships (e.g., zeppelins) were treated like commissioned surface warships and submarines, flew the U.S. ensign from their stern and carried a United States Ship (USS) designation. Non-rigid airships (e.g., blimps) continued to fly the U.S. ensign from their stern but were always considered to be primarily aircraft.

Support ships

Support ships are not designed to participate in combat and are generally not armed. For ships with civilian crews (owned by and/or operated for Military Sealift Command and the Maritime Administration), the prefix T- is placed at the front of the hull classification.

Support type

Support ships are 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. They include smaller auxiliaries which, by the nature of their duties, leave inshore waters.

Service type craft

Service craft are navy-subordinated craft (including non-self-propelled) designed to provide general support to either combatant forces or shore-based establishments. The suffix "N" refers to non-self-propelled variants.

United States Coast Guard vessels

Prior to 1965, U.S. Coast Guard cutters used the same designation as naval ships but preceded by a "W" to indicate Coast Guard commission. The U.S. Coast Guard considers any ship over 65 feet in length with a permanently assigned crew, a cutter. [27]

Current USCG cutter classes and types

USCG icebreaker Polar Sea USCGCPolarSea.jpg
USCG icebreaker Polar Sea
USCG Inland Construction Tender Saginaw WLIC Saginaw.jpg
USCG Inland Construction Tender Saginaw

Historic USCG cutter classes and types

USCG Iris-class buoy tender Firebush WLB Firebush.jpg
USCG Iris-class buoy tender Firebush
USCG Edsall-class cutter Durant WDE Durant.jpg
USCG Edsall-classcutter Durant

USCG classification symbols definitions

  • CG: all Coast Guard ships in the 1920s (retired)
  • WAGB: Coast Guard Polar-class icebreaker
  • WAGL: Auxiliary vessel, lighthouse tender (retired 1960's)
  • WAVP: seagoing Coast Guard seaplane tenders (retired 1960s)
  • WDE: seagoing Coast Guard destroyer escorts (retired 1960s)
  • WHEC: Coast Guard high endurance cutters
  • WIX: Coast Guard barque Eagle
  • WLB: Coast Guard buoy tenders
  • WLBB: Coast Guard seagoing buoy tenders/ice breaker
  • WLI: Coast Guard inland buoy tenders
  • WLIC: Coast Guard inland construction tenders
  • WLM: Coast Guard coastal buoy tenders
  • WLR: Coast Guard river buoy tenders
  • WMEC: Coast Guard medium endurance cutters
  • WMSL: Coast Guard maritime security cutter, large (referred to as national security cutters)
  • WPB: Coast Guard patrol boats
  • WPC: Coast Guard patrol craft—later reclassed under WHEC, symbol reused for Coast Guard patrol cutter (referred to as fast response cutters)
  • WPG: seagoing Coast Guard gunboats (retired 1960s)
  • WTGB: Coast Guard tug boat (140' icebreakers)
  • WYTL: Small harbor tug

USCG classification symbols for small craft and boats

Temporary designations

United States Navy Designations (Temporary) are a form of U.S. Navy ship designation, intended for temporary identification use. Such designations usually occur during periods of sudden mobilization, such as that which occurred prior to, and during, World War II or the Korean War, when it was determined that a sudden temporary need arose for a ship for which there was no official Navy designation.

During World War II, for example, a number of commercial vessels were requisitioned, or acquired, by the U.S. Navy to meet the sudden requirements of war. A yacht acquired by the U.S. Navy during the start of World War II might seem desirable to the Navy whose use for the vessel might not be fully developed or explored at the time of acquisition.

On the other hand, a U.S. Navy vessel, such as the yacht in the example above, already in commission or service, might be desired, or found useful, for another need or purpose for which there is no official designation.

Numerous other U.S. Navy vessels were launched with a temporary, or nominal, designation, such as YMS or PC, since it could not be determined, at the time of construction, what they should be used for. Many of these were vessels in the 150 to 200 feet length class with powerful engines, whose function could be that of a minesweeper, patrol craft, submarine chaser, seaplane tender, tugboat, or other. Once their destiny, or capability, was found or determined, such vessels were reclassified with their actual designation.

National Oceanic and Atmospheric Administration hull codes

The letter is paired with a three-digit number. The first digit of the number is determined by the ship's "power tonnage," defined as the sum of its shaft horsepower and gross international tonnage, as follows:

The second and third digits are assigned to create a unique three-digit hull number.

See also


  1. This odd entry is not recognized by the U.S. Naval Vessel Register, and appears only in MIL-STD-2525A: Common Warfighting Symbology (15 December 1996) and later editions (MIL-STD-2525B: Common Warfighting Symbology (30 January 1999) and MIL-STD-2525C: Common Warfighting Symbology (17 November 2008)). It seems to refer to some kind of nuclear-powered submarine used by Special Operations Forces.



  1. 1 2 Derdall and DiGiulian, (section: Cruisers)
  2. Naval History and heritage Command Online Library of Selected Images (archived from the original at
  3. United States Department of State, United States Treaties and Other International Obligations, Volume 23, Part Four, Washington, D.C.:U.S. Government Printing Office, 1972, p. 3612.
  4. "United States Department of Commerce, Annual Report of the Director of the Coast and Geodetic Survey for the Fiscal Year Ending June 30, 1964, U.S. Government Printing Office, Washington, D.C.: 1964, pp. 3–5" (PDF). Archived from the original (PDF) on 19 February 2013. Retrieved 6 May 2014.
  5. Derdall and DiGiulian, (section: Nomenclature history)
  6. Wertheim, The Naval Institute Guide to Combat Fleets of the World, 15th Edition: Their Ships, Aircraft, and Systems, p. 1005.
  7. "U.S. Navy Ships – Listed by Hull Number". Naval History and Heritage Command.
  8. Grossnick, Roy (1997). United States Naval Aviation 1910-1995 (PDF). Naval History and Heritage Command, Washington, D.C.: Naval Historical Center. p. 625. ISBN   0-945274-34-3.
  9. "English Translation of "voler" | Collins French-English Dictionary". Retrieved 7 February 2019.
  10. Bureau of Aeronautics, Navy Department."New Carrier Designations". BuAER News (title later changed to Naval Aviation News). Washington, D.C. No. 198 (1 Aug 1943) p. 9.
  11. United States. Office of Naval History. Glossary of U.S. Naval Abbreviations. 3d ed. Washington: U.S. Govt. Print. Off., 1947. p. 20.
  12. United States. Office of Naval Records and History. Glossary of US Naval Abbreviations. 5th ed. Washington: U.S. Govt. Print. Off., 1949. Naval History and Heritage Command. accessed 6 May 2017.
  13. "The Vari-Purpose Carrier". Archived from the original on 4 March 2016. Retrieved 4 August 2011.
  14. Friedman, Norman (2003). U.S. Destroyers: An Illustrated Design History (Revised ed.). Annapolis, MD: U.S. Naval Institute Press. pp. 266–267. ISBN   978-1-55750-442-5. ...a gutted Benson-class destroyer. This "corvette" (DDC) "can be readily obtained..."
  15. Derdall and DiGiulian, (section: Torpedo Boats, Destroyers, Escorts and Frigates)
  16. SNA: Modified Littoral Combat Ships to be Designated Frigates –, 15 January 2015
  17. Navy Plans to Expand, Speed-Up LCS Modifications –, 4 March 2015
  18. Russia still employs several SSA and SSAN class submarines like the Delta Stretch as well as one SST, China has older SSB and SSG types such as the Golf and Mod Romeo classes, and North Korea has built many SSCs and SSMs. See 2007–2008 Jane's Fighting Ships.
  19. U.S. Navy Ship And Service Craft Classifications Archived 16 October 2004 at the Wayback Machine
  20. Buff, Joe (June 2007). "Subs in the Littoral: Diesels Just Blowing Smoke?". Proceedings of the Naval Institute. 133 (6): 40–43. ISSN   0041-798X . Retrieved 13 June 2007. Diesel AIP boats are known as SSIs, differentiating them from purely diesel-electric-powered hunter-killer subs, or SSKs.
  21. Inactive Classification Symbols Archived 18 January 2012 at the Wayback Machine
  22. 28034_cov.fh Archived 27 September 2007 at the Wayback Machine
  23. "World Wide Landing Ship Dock/Landing Platform Dock" . Retrieved 17 May 2012.
  24. Friedman, Norman (2002). U.S. Amphibious Ships and Craft: An Illustrated Design History. Illustrated Design Histories. Naval Institute Press. p. 656. ISBN   1-55750-250-1.
  25. "Hull Classification Symbol". Retrieved 17 January 2018.
  26. "PCER-848". navsource. Retrieved 21 December 2017.
  27. "United States Coast Guard". 1 January 2006. Archived from the original on 1 January 2006. Retrieved 27 April 2020.
  28. Abunassar, US Department of Commerce, NOAA Office of the Chief Administrative Officer (OCAO). Elias. "National Oceanic and Atmospheric Administration (NOAA) Home Page".

Related Research Articles

Cruiser Type of large warships

A cruiser is a type of warship. Modern cruisers are generally the largest ships in a fleet after aircraft carriers and amphibious assault ships, and can usually perform several roles.

The escort carrier or escort aircraft carrier, also called a "jeep carrier" or "baby flattop" in the United States Navy (USN) or "Woolworth Carrier" by the Royal Navy, was a small and slow type of aircraft carrier used by the Royal Navy, the United States Navy, the Imperial Japanese Navy and Imperial Japanese Army Air Force in World War II. They were typically half the length and a third the displacement of larger fleet carriers, slower, carried fewer planes, and more-lightly armed and armored. Escort carriers were most often built upon a commercial ship hull, so they were cheaper and could be built quickly. This was their principal advantage as they could be completed in greater numbers as a stop-gap when fleet carriers were scarce. However, the lack of protection made escort carriers particularly vulnerable, and several were sunk with great loss of life. The light carrier was a similar concept to the escort carrier in most respects, but was fast enough to operate alongside fleet carriers.

Ship class Group of ships of a similar design

A ship class is a group of ships of a similar design. This is distinct from a ship type, which might reflect a similarity of tonnage or intended use. For example, USS Carl Vinson is a nuclear aircraft carrier of the Nimitz class.

Warship Ship that is built and primarily intended for naval warfare

A warship or combatant ship is a naval ship that is built and primarily intended for naval warfare. Usually they belong to the armed forces of a state. As well as being armed, warships are designed to withstand damage and are usually faster and more maneuverable than merchant ships. Unlike a merchant ship, which carries cargo, a warship typically carries only weapons, ammunition and supplies for its crew. Warships usually belong to a navy, though they have also been operated by individuals, cooperatives and corporations.

United States Navy 1975 ship reclassification

The United States Navy reclassified many of its surface vessels in 1975, changing terminology and hull classification symbols for cruisers, frigates, and ocean escorts.

The names of commissioned ships of the United States Navy all start with USS, for United States Ship. Non-commissioned, primarily civilian-manned vessels of the U.S. Navy under the Military Sealift Command have names that begin with USNS, standing for United States Naval Ship. A letter-based hull classification symbol is used to designate a vessel's type. The names of ships are selected by the Secretary of the Navy. The names are those of states, cities, towns, important persons, important locations, famous battles, fish, and ideals. Usually, different types of ships have names originated from different types of sources.

Pennant number

In the Royal Navy and other navies of Europe and the Commonwealth of Nations, ships are identified by pennant number. Historically, naval ships flew a flag that identified a flotilla or type of vessel. For example, the Royal Navy used a red burgee for torpedo boats and a pennant with an H for torpedo boat destroyers. Adding a number to the type-identifying flag uniquely identified each ship.

USCGC <i>Onondaga</i> (WPG-79)

USCGC Onondaga (WPG-79), a United States Coast Guard cutter, was built by Defoe Boat Works in Bay City, Michigan, commissioned on 11 September 1934. From her commissioning until 1941, Onondaga was stationed at Astoria, Oregon, where she performed important law enforcement duties and rendered much assistance to ships in distress. Each year she patrolled the annual pelagic seal migration to the Pribilof Islands, and she attempted to prevent out of season halibut fishing.

The United States Navy's Bureau of Ships (BuShips) was established by Congress on 20 June 1940, by a law which consolidated the functions of the Bureau of Construction and Repair (BuC&R) and the Bureau of Engineering (BuEng). The new bureau was to be headed by a chief and deputy-chief, one selected from the Engineering Corps and the other from the Construction Corps. The chief of the former Bureau of Engineering, Rear Admiral Samuel M. "Mike" Robinson, was named BuShips' first chief, while the former chief of the Bureau of Construction & Repair, Rear Admiral Alexander H. Van Keuren, was named as BuShips' first Deputy-Chief. The bureau's responsibilities included supervising the design, construction, conversion, procurement, maintenance, and repair of ships and other craft for the Navy; managing shipyards, repair facilities, laboratories, and shore stations; developing specifications for fuels and lubricants; and conducting salvage operations.

3-inch/50-caliber gun Naval gun

The 3"/50 caliber gun in United States naval gun terminology indicates the gun fired a projectile 3 inches (76 mm) in diameter, and the barrel was 50 calibers long. Different guns of this caliber were used by the U.S. Navy and U.S. Coast Guard from 1890 through the 1990s on a variety of combatant and transport ship classes.

United States ship naming conventions for the U.S. Navy were established by Congressional action at least as early as 1862. Title Thirteen, Chapter Six, of the U.S. Code, enacted in that year, reads, in part,

"The vessels of the Navy shall be named by the Secretary of the Navy under direction of the President according to the following rule:

Sailing-vessels of the first class shall be named after the States of the Union, those of the second class after the rivers, those of the third class after the principal cities and towns and those of the fourth class as the President may direct."

The Royal Canadian Navy uses hull classification symbols to identify the types of its ships, which are similar to the United States Navy's Hull classification symbol system. The Royal Navy and some European and Commonwealth navies use a somewhat analogous system of Pennant numbers.

Surface flotillas of the Kriegsmarine

Surface flotillas of the Kriegsmarine were organizational groupings of German naval vessels during World War II based on class of vessel and geographical location. Surface flotillas were not operationally deployed units, but functioned through the administrative command chain of the Kriegsmarine.

This glossary defines the various types of ships and accessory watercraft that have been used in service of the United States. Such service is mainly defined as military vessels used in the United States Navy and United States Coast Guard, as well as the defunct, incorporated, or renamed institutions such as the United States Revenue Cutter Service. Service of the United States can also be defined in this context as special government missions in the form of expeditions, such as the Wilkes Expedition or the North Pacific Exploring and Surveying Expedition. The scope of the glossary encompasses both the "Old Navy" of the United States, from its beginnings as the "Continental Navy", through the "New Navy" and up to modern day. The watercraft included in the glossary are derived from United States ships with logbooks published by the National Archives and Records Administration.


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