61 "service craft" acronyms and abbreviations

AB: Crane Ship 
AFDB: Large Auxiliary Floating Dry Dock 
AFDL: Small Auxiliary Floating Dry Dock 
AFDM: Medium Auxiliary Floating Dry Dock 
APB: Self-Propelled Barracks Ship 
APL: Barracks Craft 
ARD: Auxiliary Repair Dry Dock 
ARDM: Medium Auxiliary Repair Dry Dock 
ATA: Auxiliary Ocean Tug 
DSRV: Deep Submergence Rescue Vehicle 
DSV: Deep Submergence Vehicle 
IX: Unclassified Miscellaneous Unit 
NR: Submersible Research Vehicle 
X: Submersible Craft 
YC: Open Lighter 
YCF: Car Float 
YCV: Aircraft Transportation Lighter 
YD: Floating Crane 
YDT: Diving Tender 
YF: Covered Lighter 
YFB: Ferry Boat or Launch 
YFD: Yard Floating Dry Dock 
YFN: Covered Lighter 
YFNB: Large Covered Lighter 
YFND: Dry Dock Companion Craft 
YFNX: Lighter 
YFP: Floating Power Barge 
YFR: Refrigerated Cover Lighter 
YFRN: Refrigerated Covered Lighter 
YFRT: Range Tender 
YFU: Harbor Utility Craft 
YG: Garbage Lighter 
YGN: Garbage Lighter 
YLC: Salvage Lift Craft 
YM: Dredge 
YMN: Dredge 
YNG: Gate Craft 
YNT: Net Tender 
YO: Fuel Oil Barge 
YOG: Gasoline Barge