Navy Service Craft
| AFDB | Auxiliary Floating Drydock, Large |
| AFDL | Auxiliary Floating Drydock, Small |
| AFDM | Auxiliary Floating Drydock, Medium |
| APL | Barracks Craft |
| APL(L)61 | Berthing Barge |
| ARD | Auxiliary Repair Drydock |
| ARDM | Auxiliary Repair Drydock, Medium |
| IX | Unclassified Miscellaneous |
| SWOB | Ship Waste Off-Loading Barge |
| YC | Open Lighter |
| YCF | Car Float |
| YCV | Open Lighter |
| YD | Floating Crane |
| YDT | Diving Training Boat |
| YF | Freight Lighter |
| YFB | Ferry Boat |
| YFD | Yard Floating Drydock |
| YFN | Steel Covered Lighter |
| YFNB | Steel Covered Lighter |
| YFND | Drydock Companion Craft |
| YFNX | Special Purpose Barge |
| YFP | Power Barge |
| YFRT | Covered Lighter (range-tender) |
| YFU | Harbor Utility Craft |
| YGN | Dump Scow |
| YLC | Salvage Lift Barge |
| YM | Dredge |
| YMN | Dredge |
| YNG | Gate Vessel |
| YOG | Gasoline Barge |
| YOGN | Liquid Cargo Barge |
| YON | Liquid Cargo Barge |
| YOS | Oil Storage Barge |
| YP | Patrol Craft |
| YPD | Floating Pile Driver |
| YR | Repair Barge |
| YRB | Repair and Berthing Barge |
| YRBM | Berthing Barge |
| YRDH | Hull Workshop |
| YRDM | Hull Machinery Workshop |
| YRR | Radiological Repair Barge |
| YRST | Salvage Craft Tender |
| YSD | Seaplane Wrecking Derrick |
| YSR | Sludge Removal Barge |
| YTB | Harbor Tug |
| YTL | Harbor Tug |
| YTM | Medium Harbor Tug |
| YTT | Torpedo Trials Craft |
| YWN | Liquid Cargo Barge |
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