| PSC | Description
|
| 1900 | Frigates & corvettes |
| 1901 | Aircraft carriers |
| 1902 | Cruisers |
| 1903 | Destroyers |
| 1904 | Submarines |
| 1905 | Subchasers |
| 1906 | Minelayers & minesweepers |
| 1907 | Landing craft |
| 1908 | Torpedo boats & gun boats |
| 1909 | Hydrofoils |
| 1910 | Transport vessels-passenger & troop |
| 1911 | Amphibious assualt ships |
| 1915 | Cargo & tanker vessels |
| 1920 | Fishing vessels |
| 1921 | Tugs & towboats |
| 1922 | Fire boats |
| 1923 | Ice breakers |
| 1924 | Rep ships |
| 1925 | Tender vessels |
| 1926 | Lightships |
| 1927 | Cable ships |
| 1928 | Salvage vessels |
| 1929 | Rescue vessels |
| 1930 | Barges & lighters cargo |
| 1935 | Barges & lighters special purpose |
| 1940 | Small craft |
| 1945 | Pontoons & floating docks |
| 1950 | Floating drydocks |
| 1955 | Dredges |
| 1990 | Misc vessels |