| psc | description |
| •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• | |
| 1905 | Combat ships and landing vessels |
| 1910 | Transport vessels, passenger & troop |
| 1915 | Cargo & tanker vessels |
| 1920 | Fishing vessels |
| 1925 | Special service vessels |
| 1930 | Barges & lighters, cargo |
| 1935 | Barges & lighters, special purpose |
| 1940 | Small craft |
| 1945 | Pontoons & floating docks |
| 1950 | Floating drydocks |
| 1955 | Dredges |
| 1990 | Miscellaneous vessels |
