Starfleet Records. Fleet Ranks. Second Officer: The second officer is an officer who is third in command of a spacecraft and who assumes command of the ship when neither the captain nor the first officer is available. Some examples: In this video we can see how Lieutenant Commander Data, as second officer, tells Worf, fourth in the chain of command and, since neither the captain nor the first officer is present, according to Fleet regulations, he is the first officer whose acts as captain of the

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