AIII-2 UNITED STATES NAVAL SHIPS BY CLASS-continued Auxiliary Ships Service craft Ammunition Ship AE Small Auxiliary Floating Dry Dock (NSP) AFDL Combat Store Ship AFS Medium Auxiliary Floating Dry Dock (NSP) AFDM Miscellaneous AG Barracks Craft (NSP) APL Deep Submergence Support Ship AGDS Auxiliary Repair Dry Dock (NSP) ARD Hydrofoil Research Ship AGEH Medium Auxiliary Repair Dry Dock (NSP) ARDM Miscellaneous Command Ship AGF Deep Submergence Rescue Vehicle DSRV Missile Range Instrumentation Ship AGM Deep Submergence Vehicle DSV Oceanographic Research Ship AGOR Harbor Security Boats HSB Ocean Surveillance Ship AGOS Submersible Research Vehicle NR Surveying Ship AGS Open Lighter (NSP) YC Auxiliary Research Submarine AGSS Car Float (NSP) YCF Hospital Ship AH Aircraft Transportation Lighter (NSP)    YCV Cargo Ship AK Floating Crane (NSP) YD Vehicle Cargo Ship AKR Diving Tender (NSP) YDT Auxiliary Lighter ALS Covered Lighter YF Oiler AO Ferry Boat or launch YFB Fast Combat Support Ship AOE Yard Floating Dry Dock (NSP) YFD Gasoline Tanker AO Covered Lighter (NSP) YFN Replenishment Oiler AOR Large Cover Lighter (NSP) YFNB Transport Oiler AOT Dry Dock Companion Craft (NSP) YFND Transport AP Lighter (Special purpose) (NSP) YFNX Self-Propelled Barracks Ship APB Floating Power Barge (NSP) YFP Cable Repairing Ship ARC Refrigerated Covered Lighter YFR Salvage Ship ARS Refrigerated Covered Lighter (NSP) YFRN Submarine Rescue Ship ASR Harbor Utility Craft YFU Auxiliary Ocean Tug ATA Garbage Lighter YG Fleet Ocean Tug ATF Garbage Lighter (NSP) YGN Salvage and Rescue Ship ATS Salvage Lift Craft, Heavy (NSP) YHLC Guided Missile Ship AVM Drege YM Large Auxiliary Floating Dry Dock (NSP) AFBD Grate Craft (NSP) YNG