*NSP—Non self-propelled.
Letter prefixes to classification symbols may be added for further identification.
AIII-3
PREFIX
MEANING
E
T
F
X
N
Prototype ship in an experimental or development status
Assigned to Military Sealift Command
Being built for a foreign government
Often added to existing classifications to indicate a new class
whose characteristics have not been defined
Denotes nuclear propulsion when used as last letter of ship
symbols
UNITED STATES NAVAL SHIPS BY CLASS-continued
Service craft (Continued)
Floating Dry Dock Workshop
(Hull) (NSP)
YRDH
Fuel Oil Barge
YO
Floating Dry Dock Workshop
(Machine) (NSP)
YRDM
Gasoline Barge
YOG
Radiological Repair Barge (NSP)
YRR
Gasoline Barge (NSP)
YOGN
Seaplane Wrecking Derrick
YSD
Fuel Oil Barge (NSP)
YON
Sludge Removal Barge (NSP)
YSR
Oil Storage Barge (NSP)
YOS
Large Harbor Tug
YTB
Patrol Craft
YP
Small Harbor Tug
YTL
Floating Pile Driver (NSP)
YPD
Medium Harbor Tug
YTM
Floating Workshop (NSP)
YR
Water Barge
YW
Repair and Berthing Barge (NSP)
YRB
Water Barge (NSP)
YWN
Repair, Berthing and Messing Barge
(NSP)
YRBM
