Lieutenant commander was the third highest line-officer military ranks among commissioned officers in some star-faring species in their star navies. A person holding the rank of lieutenant commander was immediately superior to a lieutenant and immediately subordinate to a commander, and could serve in a wide range of high-responsibility roles, including, but not limited to, a senior officer or head-of-department in a larger starship, starship command of a smaller starship, an executive officer. She was usually referred to as Commander as a shortened version of the rank.

A person in command of a starship was addressed as "Captain" no matter what rank she held.

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