First officer's had the following duties and functions:
- They were the principal adviser to the captain
- They implemented the captain's orders
- They were the commander of the vessel in the event of the captain's absence, incapacitation or death
- They were to lead assault team missions when the captain presence on the ship was vital
- They had orders to assassinate the captain in the event of his failing to follow Imperial orders
Some noted first officers in Starfleet history were:
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