NameClassCountryYear of Launch
O (Planned)  M-class Light Cruiser  Germany  1945 (Projected, not actual)  
O (Planned)  O-class Battlecruiser  Germany  1941 (Projected, not actual)  
O (Planned)  M-class Light Cruiser  Germany  1943 (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  Otto Wünsche-class Submarine Tender  Germany  1940  
Oyodo  Oyodo-class Light Cruiser  Japan  1942  



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Launching of Liberty Ship SS John Stagg at the facilities of Delta Shipbuilding Company, New Orleans, Louisiana, United States, 7 Jul 1943


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"No bastard ever won a war by dying for his country. You win the war by making the other poor dumb bastard die for his country!"

George Patton, 31 May 1944


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