Name | Class | Country | Year of Launch |
O (Planned) | M-class Light Cruiser | Germany | 1945 (Projected, not actual) |
O (Planned) | M-class Light Cruiser | Germany | 1943 (Projected, not actual) |
O (Planned) | O-class Battlecruiser | Germany | 1941 (Projected, not actual) |
O'Brien | Sims-class Destroyer | United States | 1939 |
O2 (Planned) | M2-class Light Cruiser | Germany | 1947 (Projected, not actual) |
Oberon | O-class Submarine | United Kingdom | 1926 |
Oi | Kuma-class Light Cruiser | Japan | 1920 |
Oklahoma | Nevada-class Battleship | United States | |
Ommaney Bay | Casablanca-class Escort Carrier | United States | 1943 |
Onami | Yugumo-class Destroyer | Japan | |
Oregon | Indiana-class Battleship | United States | 1893 |
Orion | No Classification | Germany | 1930 |
Orzel | Orzel-class Submarine | Poland | 1938 |
Oshio | Asashio-class Destroyer | Japan | |
Ostmark | No Classification | Germany | 1936 |
Otto Wünsche | Wilhelm Bauer-class Submarine Tender | Germany | 1940 |
Oyodo | Oyodo-class Light Cruiser | Japan | 1942 |
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