The Bridge Operator is a essential part of your crew, he must level up to get better ships. Bridge Operators can belong to all of the nationalities. When you class up one, you will unlock the selected nationality's ship tree. When you pick a ship, it is permanent, so you can not change your selection.
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United States Navy | Fletcher Class |
The Royal Navy | O Class |
Kriegsmarine | Z1 Class |
Imperial Japanese Navy | Kagero Class |