Lieutenant []
This lieutenant threw a drink in Benjamin Sisko's face. Curzon Dax knocked Sisko unconscious with a right cross to keep him from retaliating. Sisko and Jadzia Dax reminisced about this incident in 2369. (DS9: "Dax")
This character was only mentioned in dialogue.
It was not made apparent if he was a Starfleet lieutenant, or a member of a different service.