| Abbreviation | Definition |
|---|---|
| WMEC | Coast Guard Medium-Endurance Cutter |
| WPB | Coast Guard Patrol Boat |
| WPG | Coast Guard Patrol Gunboat |
| WSES | Coast Guard Surface Effect Ship |
| WT | Warping Tug |
| YB | Boom vessel (Yardcraft, Boom) |
| YC | Open Car Lighter (Yardcraft, Car lighter) |
| YCF | Car Float (Yardcraft, Car Float) |
| YCU | Yard Craft, Utility |
| YCV | Yard Craft, Aircraft Lighter |
| YD | Floating Crane (Yardcraft, Derrick) |
| YDG | Garbage Scow (Yardcraft, Disposal, Garbage) |
| YDT | Diving Tender (Yardcraft, Diving Tender) |
| YF | Yardcraft, Ferryboat (Self-Propelled) |
| YFB | Yardcraft, Ferry Boat |
| YFD | YardCraft, Floating Drydock |
| YFN | Yardcraft, Covered Lighter (Non-Self Propelled) |
| YFNB | Yard Craft, Large Covered Lighter |
| YFND | Yard Craft, Dry Dock Companion Craft |
| YFNX | Yardcraft, Lighter (Special-Purpose) |