First officer

First officer may refer to:

Chief mate, the second-in-command (usually) of a merchant ship
First officer (civil aviation), the second pilot of a civil aircraft
Executive officer (military), the second-in-command of a naval vessel
The most senior civil service position in the United States Foreign Service, with responsibility for running an embassy under the authority of and reporting to the ambassador
Air Transport Auxiliary rank corresponding to Flight Lieutenant in the Royal Air Force
Women's Royal Naval Service rank corresponding to Lieutenant-Commander in the Royal Navy

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