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First officer may refer to:


Transportation

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Chief mate A chief mate (C/M) or chief officer, usually also synonymous with the first mate or first officer, is a licensed mariner and head of the deck department of a merchant ship. The chief mate is customarily a watchstander and is in charge of the shi ...
, the second-in-command (usually) of a merchant ship *
First officer (aviation) In aviation, the first officer (FO), also called co-pilot, is the pilot who is second-in-command of the aircraft to the captain, who is the legal commander. In the event of incapacitation of the captain, the first officer will assume command o ...
or "co-pilot", the second pilot of a civil aircraft


Military

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Executive officer (military) An executive officer is a person who is principally responsible for leading all or part of an organization, although the exact nature of the role varies depending on the organization. In many militaries and police forces, an executive officer, o ...
, the second-in-command of a naval vessel * First officer, the most senior civil service position in the
United States Foreign Service The United States Foreign Service is the primary personnel system used by the diplomatic service of the United States federal government, under the aegis of the United States Department of State. It consists of over 13,000 professionals carryi ...
* First officer, a rank in the
Air Transport Auxiliary The Air Transport Auxiliary (ATA) was a British civilian organisation set up at the start of the Second World War with headquarters at White Waltham Airfield in Berkshire. The ATA ferried new, repaired and damaged military aircraft between factori ...
corresponding to Flight Lieutenant in the Royal Air Force * First officer, a rank in the
Women's Royal Naval Service The Women's Royal Naval Service (WRNS; popularly and officially known as the Wrens) was the women's branch of the United Kingdom's Royal Navy. First formed in 1917 for the First World War, it was disbanded in 1919, then revived in 1939 at the ...
corresponding to Lieutenant-Commander in the Royal Navy {{disambiguation