- LCM(3)
- Landing Craft, Mechanized (Mk. III)
- LCM(6)
- Landing Craft, Mechanized (Mk. VI)
- LCP(L)
- Landing Craft, Personnel (large)
- LCP(N)
- Landing Craft, Personnel (nested)
- LCP(R)
- Landing Craft, Personnel (with ramp)
- LCR(L)
- Landing Craft, Rubber (large)
- LCR(S)
- Landing Craft, Rubber (small)
- LCS(L)(3)
- Landing Craft, Support (large) (Mk. III)
- LCS(S)(1)
- Landing Craft, Support (small) (Mk. I)
- LCS(S)(2)
- Landing Craft, Support (small) (Mk. II)
- LCT(5)
- Landing Craft, Tank (Mk. V)
- LCT(6)
- Landing Craft, Tank (Mk. VI)
- LCV
- Landing Craft, Vehicle
- LCVP
- Landing Craft, Vehicle and Personnel
- LSD
- Landing Ship, Dock
- LSM
- Landing Ship, Medium
- LSM(R)
- Landing Ship, Medium (rocket)
- LST
- Landing Shiip, Tank
- LSV
- Landing Ship, Vehicle
- LSX
- (Planned Landing Ship)
- LVT(1)
- Landing Vehicle, Tracked (Mk. I)
- LVT(A)(1)
- Landing Vehicle, Tracked (armored) (Mk. I)
- LVT(2)
- Landing Vehicle, Tracked (Mk. II)
- LVT(A)(2)
- Landing Vehicle, Tracked (armored) (Mk. II)
- LVT(3)
- Landing Vehicle, Tracked (Mk. III)
- LVT(4)
- Landing Vehicle, Tracked (Mk. IV)
- LVT(A)(4)
- Landing Vehicle, Tracked (armored) (Mk. IV)
- PC
- Submarine Chaser (173')
- PCE
- Patrol Craft Escort
- PCE(R)
- Patrol Craft Escort (rescue)
- PCS
- Submarine Chaser (173')
- PE
- Eagel Boat
- PF
- Frigate
- PG
- Gunboat
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- PGM
- Motor Gunboat
- PR
- River Gunboat
- PT
- Motor Torpedo Boat
- PY
- Yacht
- PYc
- Coastal Yacht
- SC
- Submarine Chaser (110')
- SS
- Submarine
- YA
- Ash Lighter
- YAG
- Miscellaneous District Ausiliary
- YC
- Open Lighter
- YCF
- Car Float
- YCK
- Open Cargo Lighter
- YCV
- Aircraft Transportation Lighter
- YDG
- Degaussing Vessel
- YDT
- Diving Tender
- YF
- Covered Lighter; Range Tender; Provision Store Lighter
- YFB
- Ferryboat and Launch
- YFT
- Torpedo Transportation Lighter
- YG
- Garbage Lighter
- YHB
- Houseboat
- YHT
- Heating Scow
- YMS
- Motor Mine Sweeper
- YN
- Net Tender
- YNg
- Gate Vessel
- YNT
- Net Tender, Tug Class
- YO
- Fuel Oil Barge
- YOG
- Gasoline Barge
- YP
- District Patrol Vessel
- YPK
- Pontoon Stowage Barge
- YR
- Floating Workshop
- YRD(H)
- Floating Workshop, Dry Dock (hull)
- YRD(M)
- Floating Workshop, Dry Dock (machinery)
- YS
- Stevedore Barge
- YSD
- Seaplane Wrecking Derrick
- YSP
- Salvage Pontoon
- YSR
- Sludge Removal Barge
- YTB
- Harbor Tug, Big
- YTL
- Harbor Tug, Little
- YTM
- Harbor Tug, Medium
- YTT
- Torpedo Testing Barge
- YTX
- (Planned District Craft)
- YW
- Water Barge
- AT, YT
- Tugs (Ocean, Harbor)
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