Commander was a naval rank used both by the Coalition Space Fleet and the Legionnaire Navy. It was typically used by experienced Command Officers aboard a starship. The Executive Officer always carried this rank, and reported directly to the Captain.
It was rare for any other Command Officer to hold this rank. Usually, that was a sign of distinguishment.
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- Jenice Murray - Executive Officer, C.S.C. Lilith's Omen (2190-2193)