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US Designations

US Army Air Corps, US Army Air Corps, US Army Air Force, Tri-Service

1919

The first designation system was invented by the Air Service of the US Army in 1919. Fifteen numbered designations were introduced and a few additional, not numbered ones:

    I.    PW     Pursuit, water cooled

   II.    PN     Pursuit, night work

  III.    PA     Pursuit, air cooled

   IV.    PG     Pursuit, ground attack

    V.    TP     Two-seat pursuit

   VI.    GA     Ground attack

  VII.    IL     Infantry liaison

 VIII.    NO     Night observation

   IX.    AO     Artillery observation

    X.    CO     Corps observation

   XI.    DB     Day bombardment

  XII.    NBS    Night bombardment, short distance

 XIII.    NBL    Night bombardment, long distance

  XIV.    TA     Training, air cooled

   XV.    TW     Training, water cooled



          A      Ambulance

          M      Messenger

          R      Racer

          T      Transport

1924

The 1919 system was rather complicated, and a new system was introduced in 1924. The following designations were applied:

          A      Attack

          AT     Advanced trainer

          B      Bomber

          C      Cargo

          HB     Heavy bomber

          LB     Light bomber

          O      Observation

          OA     Observation Amphibian

          P      Pursuit

          PT     Primary trainer

This system was formally abandoned in 1948. But then 22 additional categories had been introduced, including:

          AG     Attack Glider

          BC     Basic Combat (trainer)

          BG     Bomb Glider (glide bomb)

          BQ     Bomb, guided

          BT     Basic Trainer

          BLR    Bomber, long range

          BQ     Bomber, radio-controlled

          CB     Cargo Bomber

          CG     Cargo glider

          CQ     Target controller

          F      Photographic reconaissance

          FG     Fuel-carrying glider

          FM     Fighter, multiplace

          G      Glider

          G      Gyroplane

          GB     Glide bomb

          GT     Glide Torpedo

          JB     Jet-propelled bomb

          L      Liaison

          O      Observation

          OA     Observation, amphibian

          OQ     Target, flying model

          PB     Pursuit biplace

          PG     Powered glider

          PQ     Aerial target

          R      Rotorcraft

          TG     Training glider

          UC     Utility cargo

          FP     Reconaissance fighter

X and Y letters were used as prefix to indicate prototypes and preseries aircraft. The prefix 'Y1' was used for aircraft bought with 'F-1' funds instead of normally allocated money. The letter Z was used for obsolete aircraft. In some cases, R (meaning 'restricted' was also used for this purpose. Some experimental aircraft had an 'E' prefix, meaning 'Exempt', instead of the more common 'X'.

1948

The designation system of the USAF was changed in 1948. The new system seems to have mostly similar to that that was accepted as the tri-service system in 1962. Some aircraft were renumbered, e.g. the F-110 became the F-4. Some designations of the 1948 system were not adopted by the 1962 system:

          VZ     VTOL experimental

1962

In 1962 a new designation was instated for all three services, USAF, USN and USMC. Here is the description of this system, as provided by Erwin Moedersheim:

DEPARTMENT OF DEFENSE PUBLICATION 4120.15-L MISSION, DESIGN, AND SERIES SYSTEM (MDS)

The current military vehicle designation system for military aircraft was introduced as a standard for all services in 1962. It is used for three purposes:

  1. Aircraft
  2. Guided missiles, rockets, boosters, and satellites
  3. Electronic equipment
The system consists of designations of the following type:
XXXX-...X (-..-XX)
where X indicates a letter, and . indicates a number. Not all letters are used all the time.

1. AIRCRAFT DESIGNATIONS:

Starting at the first dash in the designation above, and moving to the LEFT, we encounter:

VEHICLE TYPE:
It indicates the type of vehicle at hand, e.g. helicopter, V/STOL. For normal aircraft, this designator is NOT used. (Example: the SH-2F uses the H to indicate it is a helicopter. The F-16A is a regular aircraft, and does not have a vehicle type designator).
     G  - Glider

     H  - Helicopter

     S  - Spaceplane

     V  - VTOL/STOL

     Z  - Lighter than air

BASIC MISSION:
This is the most important designator. It indicates the primary design task of the aircraft. (Example: The B-1B uses a B because it is a bomber).
     A  - Attack

     B  - Bomber

     C  - Cargo/ transport

     E  - Special electronic installation

     F  - Fighter

     O  - Observation

     P  - Patrol

     R  - Reconnaissance:

        ER  - Electronic Reconnaissance

        SR  - Strategic Reconnaissance

        TR  - Tactical Reconnaissance

     S  - Anti-Submarine Warfare (ASW)

     T  - Trainer

     U  - Utility

     X  - Research

MODIFIED MISSION:
Indicates the vehicle has been modified for a specific mission. Only one modified mission symbol is allowed. The modified mission symbol precedes the basic mission symbol.
     A  - Attack

     C  - Cargo/ transport

     D  - Drone control

     E  - Special electronic installation

     F  - Fighter

     H  - Search and Rescue (SAR)

     K  - Tanker (from Kerosine tanker)

     L  - Cold weather

     M  - Multi-mission

     O  - Observation

     P  - Patrol

     Q  - Drone

     R  - Reconnaissance

     S  - Anti-Submarine Warfare (ASW)

     T  - Trainer

     U  - Utility

     V  - Staff/ VIP transport

     W  - Weather

STATUS PREFIX:
Indicates that the vehicle is not standard due to tests, modifications, or experiments. This prefix precedes the modified and basic mission symbols.
     G  - Permanently grounded

     J  - Special test temporary

     N  - Special test permanent

     X  - Experimental

     Y  - Prototype

     Z  - Planning

Returning to the first dash, and moving RIGHT, we encounter:

DESIGN NUMBER:
Supposedly in sequential order, it indicates the model aircraft within the basic mission category. For example, C-20D, C-21A, C-22A, C-23B, EC-24A, VC-25A, C-26A, C-27A, etc. Obviously, the order is not always sequential, e.g. F-23, F-111, F-117.

SERIES:
Indicates alphabetically major modifications to the original design, which is indicated by the A. For example, the F-16B is a major modification of the F-16A. I and O are skipped.

Then we officially encounter another dash, and two more designators. These are not used very often, however, and are not always indicated on the aircraft. Moving to the right from the dash, we find:

BLOCK NUMBER:
Indicates the block of identical aircraft to which the aircraft belongs.
(another dash)
MANUFACTURER IDENTIFICATION CODE:
Indicates the manufacturer.
Let's take an example:

                                              NKC-135A

                                              |||  | |

    Status prefix ----------------------------+||  | |

                                               ||  | |

    Modified mission --------------------------+|  | |

                                                |  | |

    Basic mission ------------------------------+  | |

                                                   | |

    Design number ---------------------------------+ |

                                                     |

    Series ------------------------------------------+

Sometimes, the block number and manufacturer code are added to the designation:

                                              F-4G-43-MC

                                              | || |  |

    Basic mission ----------------------------+ || |  |

                                                || |  |

    Design number ------------------------------+| |  |

                                                 | |  |

    Series --------------------------------------+ |  |

                                                   |  |

    Block number ----------------------------------+  |

                                                      |

    Manufacturer--------------------------------------+

GUIDED MISSILES, ROCKETS, BOOSTERS, AND SATTELITES:

Starting at the first dash in the designation above, and moving to the LEFT, we encounter:

VEHICLE TYPE:
Indicates the type of (unmanned) vehicle.
     B - Booster

     M - Guided missile or drone

     N - Probe

     R - Rocket

     S - Satellite

BASIC MISSION:
This is the most important designator. It indicates the primary design task of the vehicle.

     C - Cargo/ transport

     D - Decoy

     E - Electronic or communication

     G - Surface attack

     I - Intercept aerial or space

     L - Launch detection or surveillance

     M - Scientific/ calibration

     N - Navigation

     Q - Drone

     S - Space support

     T - Training

     U - Underwater attack

     W - Weather

LAUNCH ENVIRONMENT:
Type of launching platform.
     A - Air

     B - Multiple

     C - Coffin

     F - Individual

     G - Runway

     H - Silo stored

     L - Silo launched

     M - Mobile

     P - Soft pad

     R - Ship

     S - Space

     U - Underwater

STATUS PREFIX:
     C - Captive

     D - Dummy

     J - Special test temporary

     M - Modified

     N - Special test permanent

     X - Experimental

     Y - Prototype

     Z - Planning

The same rules as for aircraft apply to the rest of the designation, except for the block and manufacturer. This might be replaced by a CONFIGURATION NUMBER, which indicates a modification.

Let's take an example:

                                             AIM-9L

                                             ||| ||

   Launch environment -----------------------+|| ||

                                              || ||

   Basic mission -----------------------------+| ||

                                               | ||

   Vehicle type -------------------------------| ||

                                                 ||

   Design number --------------------------------+|

                                                  |

   Series ----------------------------------------+

ELECTRONIC EQUIPMENT:

Starting at the first dash in the designation above, and moving to the LEFT, we encounter:

PURPOSE:
The primary task of this electronic equipment.
     A - Auxilary assemblies

     B - Bombing

     C - Communications

     D - Direction finding, recon, and/or surveillance

     E - Ejection and/or release

     G - Fire control or light finding

     H - Recording or reproducing

     K - Computing

     M - Maintenance or test assemblies

     N - Navigational aids

     Q - Special or combinations of purposes

     R - Receiving/ passive detecting

     S - Detecting and/or range bearing, search

     T - Transmitting

     W - Automatic flight or remote control

     X - Identification and recognition

     Y - Surveillance and control

EQUIPMENT TYPE:
     A - Infrared or invisible light

     C - Carrier (wire)

     D - Radiac

     E - Nupac

     F - Photographic

     G - Telegraph or teletype

     I - Interphone or public address

     J - Electromechanical or inertial wire covered

     K - Telemetering

     L - Countermeasure

     M - Meteorological

     N - Sound in air

     P - Radar

     Q - Sonar and underwater sound

     R - Radio

     S - Special types, magnetic combination of types

     T - Telephone (wire)

     V - Visual or visible light

     W - Armament

     X - Facsimile or TV

     Y - Data processing

PLATFORM/ INSTALLATION:
     A - Airborne (piloted aircraft)

     B - Underwater mobile (submarine)

     C - Air transportable

     D - Pilotless carrier

     F - Fixed (ground)

     G - General purpose use

     K - Amphibious

     M - Ground mobile

     P - Portable

     S - Water

     T - Ground transportable

     U - General utility assemblies

     V - Ground vehicular

     W - Water surface and underwater combination

     Z - Piloted and pilotless airborne combination

JOINT SERVICE INDICATOR:
     AN - Joint services

The same rules as for aircraft apply to the rest of the designation, except for the block and manufacturer. This might be replaced by a VARIABLE GROUPING, which indicates a modification.

Let's take an example:

                                           AN/APG-68A

                                            | |||  ||

   Approved for joint services -------------+ |||  ||

                                              |||  ||

   Installation ------------------------------+||  ||

                                               ||  ||

   Equipment type -----------------------------+|  ||

                                                |  ||

   Purpose -------------------------------------+  ||

                                                   ||

   Design number ----------------------------------+|

                                                    |

   Series ------------------------------------------+


The US Navy designation systems

Aircraft

The original aircraft designation system adopted by the USN was qualitatively different from that adopted by the Army, because not only the function of the aircraft but also its manufacturer was indicated. (A similar system was used by the Japanese Navy.)

Designations were built as follows:

  1. One or two function letters. The F4F was a Fighter, the T4M a Torpedo bomber, the SB2C a Scout-Bomber, ...
  2. A sequence number, indicating that the aircraft was the nth one with this function built by the manufacturer. The number 1 was not written. The fighters built by Grumman for the USN were thus labeled: FF, F2F, F3F, F4F, ...
  3. A letter indicating the manufacturer. The F4F was built by Grumman, the F4U by Vought, the F4B by Boeing, ...
  4. A dash.
  5. A number indicating the subtype. The designation F4U-4 indicates that the aircraft is the fourth subtype of the F4U.
  6. Optionally, a letter to indicate minor changes. The F4U-1A was a F4U-1 with a raised cabin and improved cockpit glazing.
There was a short period at the introduction of the system when the manufacturer letter was placed first. Hence a designation as Vought UO, an observation aircrcaft (O) built by Vought (U), and a few others.

Function letters and combinations were subject to changes, to simplify the system, make room for new categories, or adapt the system to changed practice. For example: shortly after WWII the USN abandoned the TB, BF and SB designations for a simplified A designation, indicating the replacement of specialized torpedo and dive bombers by all-round attack aircraft.

      A     Attack

      A     Ambulance

      BF    Fighter bomber

      F     Fighter

      G     Utility transport

      H     Ambulance

      HC    Transport helicopters

      HJ    Utility helicopter (?)

      HN    Utility helicopter (?)

      HO    Observation helicopter

      HR    Transport helicopter

      HS    ASW helicopter

      HT    Training helicopter

      HU    Utility helicopter

      J     Utility transport

      JR    Utility transport

      LB    Bomb Glider (unmanned, of course)

      LN    Training glider

      M     Observation / Multi-role

      N     Trainer

      O     Observation

      OS    Observation / Scout

      P     Patrol

      PB    Patrol Bomber

      R     Racer

      R     Transport

      SB    Scout bomber (dive bomber)

      SF    Scout Torpedo bomber

      SN    Scout trainer

      SO    Scout / Observation

      T     Trainer

      TB    Torpedo bomber

      TD    Target drone? Unmanned aircraft.

      TS    Torpedo bomber / Scout

      U     Utility

      W     AEW

The X was a prefix applied to prototypes.

Manufacturer letters were not always unique, nor always the same for one manufacturer. The USN manipulated the system to bring numerous manufacturers in line with only 26 letters, or more correctly only 23 because it didn't use all.

   A = Brewster                    F2A Buffalo

       General Aviation            XFA

       Noorduyn                    JA Norseman

       Allied                      LRA

   B = Beechcraft                  GB Traveller

       Boeing                      F2B

       Budd                        RB Conestoga

   C = Curtiss                     F6C Hawk

       Cessna                      JRC Bobcat

       Culver                      TD2C

   D = Douglas                     A4D Skyhawk

       McDonnell                   F2D Phantom

   E = Piper                       HE

       Cessna                      OE-2 Birddog

       Hiller                      HOE

       Bellanca                    XSE-1

       Edo                         XOSE-1

       Pratt-Read (Gould)          LBE

       Elias                       EM-2

   F = Grumman                     F4F Wildcat

       Fairchild                   SBF Helldiver

   G = Goodyear                    FG Corsair

       Great Lakes                 BG

       Eberhart                    XF2G-1

   H = McDonnell                   FH Phantom

       Howard                      GH Nightingale

       Hall                        PH

   J = North American              FJ Fury

       Berliner-Joyce              F3J

       General Aviation            PJ

   K = Fairchild                   J2K Forwarder

       Kaman                       HOK

       Keystone                    NK Pup

   L = Bell                        FL Airabonita

       Columbia                    XJL

       Loening                     OL

   M = General Motors (Eastern)    F3M Bearcat

       Bell                        FM Airacuda

       Martin                      P4M Mercator

   N = Naval Aircraft Factory      PBN Catalina

       Seversky                    FN

       Stinson                     RN Reliant

   O = Lockheed                    FO Lightning

       Piper                       UO

   P = Spartan                     NP-1

       Piper                       XLNP

       Pitcairn                    OP

       Piasecki                    HUP Retriever

   Q = Fairchild                   R4Q flying Boxcar

   R = Ryan                        FR Fireball

       Interstate                  XTDR

       Ford                        RR Trimotor

   S = Stearman                    N2S

       Sikorsky                    HR2S

       Aeromarine                  FS

       Schweizer                   LNS

   T = Northrop                    FT Black Widow

       Timm                        N2T Tutor

       Taylorcraft                 LNT Grasshopper

       Temco                       TT-1

   U = Chance-Vought               F4U Corsair

   V = Lockheed                    P2V Neptune

       Vultee                      SNV

   W = Wright                      F3W Apache

       Waco                        JW

       Canadian Car & Foundry      SBW Helldiver

   Y = Consolidated                PBY Catalina

       Convair                     XFY pogo

       Stinson                     OY Sentinel

   Z = Wilford                     OZ

Ships, boats, and other vessels

     AB    Crane Ship

     ABD   Advanced Base Dock

     ABSD  Advanced Base Sectional Dock

     AC    Collier

     ACS   Auxiliary Crane Ship

     AD    Destroyer Tender

     AE    Ammunition Ship

     AEFS  Fleet Replenishment Ship

     AF    Stores Ship

     AFD   Mobile Floating Dry Dock

     AFS   Fleet Stores Ship

     AG    Miscellaneous Auxiliary

     AGC   Amphibious Force Flagship

     AGDS  Launch Area Support Ship

     AGF   Command Ship

     AGL   Lighthouse Tender (Coast Guard)

     AGM   Missile Range Instrumentation Ship

     AGP   Motor Torpedo Boat Tender

     AGOR  Oceanographic Research Ship

     AGOS  Ocean Surveillance Ship

     AGS   Surveying Ship

     AGSS  Auxiliary Research/Experimental Submarine

     AGTR  Auxiliary Technical Reconaissance Ship

     AH    Hospital Ship

     AK    General Cargo Ship

     AKA   Attack Cargo Ship

     AKD   Deck-Hold Cargo Ship

     AKN   Net Cargo Ship

     AKR   Vehicle Cargo Ship

     AKS   General Stores Carho Ship

     AKV   Aircraft Ferry

     AL    Lightship (Coast Guard)

     AM    Fleet Minesweeper (steel)

     AMB   Base Minesweeper

     AMC   Coastal Minesweeper (wooden)

     AN    Net Laying Ship

     AO    Oiler

     AOE   Fast Combat Support Ship

     AOG   Gasoline Carrier / Tanker

     AOR   Replenishment Oiler

     AOT   Transport Oiler / Tanker

     AP    Troop Ship, non-landing

     APA   Attack Transport Ship

     APB   Barrack Ship, Self-Propelled

     APC   Small Coastal Transport

     APD   Fast Destroyer Transport

     APF   Adminstration Flagship

     APG   Supporting Gunnery Ship

     APH   Transport, Evacuation of Wounded

     APL   Auxiliary Personnel Light / Labour Transport Ship

     APM   Mechanized Artillery Transport

     APN   Non-Mechanized Artillery Transport

     APR   Rescue Transport

     APS   Transport Submarine

     APSS  Vehicle Transport Submarine

     AR    Repair Ship

     ARB   Repair Ship, Battle Damage

     ARC   Cable Repair/Laying Ship

     ARD   Floating Dry Dock

     ARD   Repair Dock, Concrete

     ARG   Repair Ship, Landing Craft / Repair Ship, Internal Combustion Engine

     ARH   Repair Ship, Hull

     ARL   Repair Ship, Landing Craft

     ARM   Repair Ship, Heavy Machinery

     ARS   Salvage Vessel

     ARV   Aviation Repair Vessel

     AS    Submarine Tender

     ASR   Surmarine Rescue Vessel

     ASSP  Auxiliary Transport Submarine

     AT    Tug

     ATA   Auxiliary Tug

     ATF   Oceangoing Fleet Tug

     ATO   Old Tug

     ATR   Recue Tug

     ATS   Salvage & Rescue Ship

     AV    Seaplane Tender

     AVC   Catapult Lighter

     AVD   Seaplane Tender (Destroyer)

     AVP   Seaplane Tender (Small)

     AVR   Aircraft Rescue Vessel

     AVS   Aviation Supply Ship

     AVT   Auxiliary Aircraft Transport

     AW    Distilling Ship

     AWK   Water Tanker

     AZ    Airship Tender (Lighter-Than-Air)

     BB    Battleship

     BC    Battlecruiser

     BCGN  Nuclear-powered Guided Missile Battlecruiser

     BRDM  Floating Dry Dock

     CA    Heavy Gun Cruiser

     CAG   Guided Missile Heavy Cruiser

     CB    Large Cruiser

     CC    Tactical Command Ship

     CG    Guided Missile Cruiser

     CGN   Nuclear-powered Guided Missile Cruiser

     CHG   Helicopter Cruiser with Guided Missiles

     CL    Light Cruiser

     CLAA  Light Anti-Aircraft Cruiser

     CLC   Task Fleet Command Ship

     CLG   Guided Missile Light Cruiser

     CLGN  Guided Missile Light Cruiser, Nuclear-powered

     CLK   Hunter-Killer Cruiser

     CM    Minelayer

     CMC   Minelayer, Coastal

     CONT  Container Ship

     CV    Aircraft Carrier

     CVA   Attack aircraft carrier

     CVAN  Attack aircraft carrier, nuclear powered.

     CVB   Large Aircraft Carrier

     CVE   Escort aircraft carrier.

     CVH   Helicopter Carrier

     CVHA  Assault Helicopter Transport

     CVHE  Escort Helicopter Aircraft Carrier.

     CVHG  Helicopter Carrier with guided missile armament.

     CVL   Light aircraft carrier.

     CVN   Nuclear-powered aircraft carrier.

     CVS   Support (ASW) Aircraft Carrier.

     CVT   Training Aircraft Carrier

     CVU   Utility Aircraft Carrier

     DD    Destroyer

     DDE   Escort Destroyer

     DDG   Guided Missile Destroyer

     DDH   Helicopter Destroyer

     DDK   Hunter-Killer Destroyer

     DDR   Radar Picket Destroyer

     DE    Escort Destroyer

     DEC   Control Escort Ship

     DEG   Guided Missile Escort Ship

     DER   Radar Picket Escort Ship

     DL    Frigate

     DLG   Guided Missile Frigate

     DLGH  Guided Missile Frigate, Helicopter

     DLGN  Guided Missile Frigate, Nuclear-powered

     DM    Light Minelayer (Former Destroyers)

     DMS   Minesweeper, Fast (Former Destroyers)

     EDD   Experimental Destroyer

     EDE   Experimental Escort Ship

     FF    Frigate

     FFG   Guided Missile Frigate

     FFGH  Guided Missile Frigate, Helicopter

     FFH   Frigate, Helicopter

     FFL   Corvette

     IFS   Inshore Fire Support Ship

     IX    Unclassified Auxiliary

     IXS   Unclassified Auxiliary Submarine

     LASS  Launch Area Support Ship

     LCAC  Landing Craft, Air Cushioned

     LCC   Command Ship for Amphibious Operations

     LCI   Landing Craft, Infantry

     LCM   Landing Craft, Mechanized units

     LCP   Landing Craft, Personnel

     LCT   Landing Craft, Tank

     LCU   Landing Craft, Utility

     LCVP  Landing Craft, Vehicles and Personnel

     LHA   Helicopter Assault Ship

     LHD   Amphibious Assault Ship

     LKA   Amphibious Cargo Ship

     LPA   Amphibious Transport

     LPD   Amphibious Transport Dock

     LPH   Amphibious Assault Ship

     LPSS  Amphibious Transport Submarine

     LS    Landing Ship

     LSD   Landing Ship, Dock

     LSI   Landing Ship, Infantry

     LSM   Landing Ship, Medium

     LSMR  Landing Ship, Medium, Rockets

     LST   Landing Ship, Tank

     LSU   Landing Ship, Utility

     LVT   Landing Vehicle, Tracked

     MCM   Mine Countermeasures Ship

     MHC   Coastal Mine Hunter

     ML    Minelayer

     MS    Minesweeper

     MSB   Minesweeping Boat

     MSH   Minesweeper,

     MSO   Minesweeper, Ocean

     MV    Merchant Vessel

     PBR   Patrol Boat, River

     PC    Patrol Corvette

     PCE   Escort Patrol Corvette

     PCS   Patrol Corvette, Minesweeping

     PF    Patrol Frigate

     PG    Patrol Gunboat

     PGH   Patrol Gunboat, Hydrofoil

     PGM   Patrol Gunboat, Motor

     PHM   Missile-armed Patrol Hydrofoil.

     PM    Patrol Missile Boat

     PT    Torpedo Boat

     PTG   Torpedo Boat, guided missile armament

     PTM   Missile-armed Torpedo Boat

     PY    Patrol Vessel (Converted Yacht)

     PYC   Coastal Patrol Vessel (Converted Yacht)

     SC    Submarine Chaser (Wooden)

     SM    Minelayer Submarine

     SS    Submarine

     SSA   Cargo Submarine

     SSB   Ballistic Missile Submarine

     SSBN  Nuclear-powered Ballistic Missile Submarine

     SSG   Guided Missile Submarine

     SSGN  Nuclear-powered Guided Missile Submarine

     SSK   Hunter-Killer Submarine

     SSKN  Hunter-Killer Submarine, nuclear powered

     SSN   Nuclear-powered (attack) Submarine

     SSO   Oiler Submarine

     SSP   Vehicle Transport Submarine

     SSR   Radar Picket Submarine

     SSRN  Radar Picket Submarine, nuclear powered

     TANK  Tanker

     TRAN  Transport

     YA    Ash Lighter

     YAG   District Auxiliary, Miscellaneous

     YC    Open Lighter

     YCF   Car Float (Railroad)

     YCK   Open Cargo Lighter

     YCV   Aircraft Transportation Lighter

     YD    Floating Derrick

     YDG   Degaussing Vessel

     YDT   Diving Tender

     YE    Ammunition Tender

     YF    Covered Lighter

     YFB   Ferry Boat / Launch

     YFD   Floating Dry Dock

     YF    Torpedo Transportation Lighter

     YG    Garbage Lighter

     YH    Ambulance Boat

     YHB   House Boat

     YHT   Heating Scow

     YLA   Open Landing Lighter

     YM    Dredge

     YMS   Motor Mine Sweeper

     YN    Net Tender

     YNG   Gate Vessel

     YNT   Net Tender, Tuc Class

     YO    Fuel Oil Barge

     YOG   Gasoline Barge

     YOS   Oil Storage Barge

     YP    District Patrol Craft

     YPD   Pile Driver (Floating)

     YPK   Pontoon Storage Barge

     YR    Floating Workshop

     YRD   Floating Workshop, Drydock

     YS    Stevedoring Barge

     YSD   Seaplane Wrecking Derrick

     YSP   Salvage Pontoon

     YSR   Sludge Removal Barge

     YTB   Large Harbour Tug

     YTL   Little Harbour Tug

     YTM   Medium Harbour Tug

     YTT   Torpedo Testing Barge

     YW    Water Barge


Emmanuel Gustin
[email protected]

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