*NSP—Non self-propelled.Letter prefixes to classification symbols may be added for further identification.AIII-3PREFIX MEANINGETFXNPrototype ship in an experimental or development statusAssigned to Military Sealift CommandBeing built for a foreign governmentOften added to existing classifications to indicate a new classwhose characteristics have not been definedDenotes nuclear propulsion when used as last letter of shipsymbolsUNITED STATES NAVAL SHIPS BY CLASS-continuedService craft (Continued)Floating Dry Dock Workshop(Hull) (NSP)YRDHFuel Oil BargeYOFloating Dry Dock Workshop(Machine) (NSP)YRDMGasoline BargeYOGRadiological Repair Barge (NSP)YRRGasoline Barge (NSP)YOGNSeaplane Wrecking DerrickYSDFuel Oil Barge (NSP)YONSludge Removal Barge (NSP)YSROil Storage Barge (NSP)YOSLarge Harbor TugYTBPatrol CraftYPSmall Harbor TugYTLFloating Pile Driver (NSP)YPDMedium Harbor TugYTMFloating Workshop (NSP)YRWater BargeYWRepair and Berthing Barge (NSP)YRBWater Barge (NSP)YWNRepair, Berthing and Messing Barge(NSP)YRBM
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