- Regional/ North America/ United States/ Government/ Military/ Navy/ Ships/ Surface Combatant/ Destroyer/ USS_O'Bannon@ (3)
- Regional/ North America/ United States/ Government/ Military/ Navy/ Ships/ Surface Combatant/ Destroyer/ USS_O'Brien@ (3)
- Regional/ North America/ United States/ Government/ Military/ Navy/ Ships/ Surface Combatant/ Guided Missile Destroyer/ USS_O'Kane@ (3)
- Regional/ North America/ United States/ Government/ Military/ Navy/ Ships/ Amphibious/ Landing/ Dock/ USS_Oak_Hill@ (5)
- Regional/ North America/ United States/ Government/ Military/ Navy/ Ships/ Submarines/ Ballistic/ USS_Ohio@ (3)
- Regional/ North America/ United States/ Government/ Military/ Navy/ Ships/ Surface Combatant/ Battleship/ USS_Ohio@ (4)
- Regional/ North America/ United States/ Government/ Military/ Navy/ Ships/ Amphibious/ Assault/ Decommissioned/ USS_Okinawa@ (2)
- Regional/ North America/ United States/ Government/ Military/ Navy/ Ships/ Submarines/ Attack/ USS_Oklahoma_City@ (2)
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- Regional/ North America/ United States/ Government/ Military/ Navy/ Ships/ Surface Combatant/ Battleship/ USS_Oklahoma@ (5)
- Regional/ North America/ United States/ Government/ Military/ Navy/ Ships/ Surface Combatant/ Destroyer/ USS_Oldendorf@ (4)
- Regional/ North America/ United States/ Government/ Military/ Navy/ Ships/ Surface Combatant/ Battleship/ USS_Oregon@ (5)
- Regional/ North America/ United States/ Government/ Military/ Navy/ Ships/ Mine Warfare/ Minehunter/ USS_Oriole@ (3)
- Regional/ North America/ United States/ Government/ Military/ Navy/ Ships/ Aircraft Carrier/ Multi-Purpose/ Decommissioned/ USS_Oriskany@ (6)
- Regional/ North America/ United States/ Government/ Military/ Navy/ Ships/ Surface Combatant/ Guided Missile Destroyer/ USS_Oscar_Austin@ (3)
- Regional/ North America/ United States/ Government/ Military/ Navy/ Ships/ Mine Warfare/ Minehunter/ USS_Osprey@ (3)
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