Ranks and roles on DS9
There seems to be quite a bit of confusion in the DS9 fandom about the ranks and roles of the characters so I though I might repost here this short guide I compiled a couple of months ago on Discord. I admit that this is a little pedantic since ranks below Captain rarely matter in Star Trek, but since rank affects the way characters are addressed onscreen it’s something I give a lot of thought to. All information comes from Memory Alpha. (Roles and ranks are capitalized for clarity, but they’re usually written all in lowercase.)
Benjamin Sisko: Commander ⚪️⚪️⚪️ in seasons 1-3, gets promoted to Captain ⚪️⚪️⚪️⚪️ in 3x26 “The Adversary” and is one until the end of the show. He is the Commanding Officer on DS9.
Kira Nerys: Major of the Bajoran Militia in seasons 1-6, promoted to Colonel in season 7 (she already is one in 7x01). In addition to her Bajoran rank, she receives a Starfleet commission with the rank of Commander ⚪️⚪️⚪️ in 7x21 “When It Rains…”. She was appointed the position of Bajoran Liaison Officer on the station, but she is for all intents and purposes Sisko’s first officer, until she assumes command of the station at the end of 7x25 “What You Leave Behind”.
Jadzia Dax: Lieutenant ⚪️⚪️ in seasons 1-3, gets promoted to Lieutenant Commander ⚪️⚪️⚫️ offscreen between seasons and is one in seasons 4-6. Usually addressed as ‘commander’ from then on. She is the (Chief) Science Officer aboard the station.
Ezri Dax: Ensign ⚪️ in episodes 7x01-03, gets promoted to Lieutenant junior grade ⚪️⚫️ at the end of 7x03 “Afterimage” and is one until the end of the show. After the promotion she assumes the role of Counselor on the station.
Julian Bashir: Lieutenant junior grade ⚪️⚫️ in seasons 1-3, gets promoted offscreen between season 3 and 4 and is a Lieutenant ⚪️⚪️ from season 4 until the end of the show. He is the Chief Medical Officer (CMO) on DS9.
Worf: started out as a Lieutenant junior grade ⚪️⚫️ in the command division on the Enterprise-D, then assumed the role of Security Chief and Tactical Officer switching to the operations division. He was promoted to Lieutenant ⚪️⚪️ offscreen before season 3 of TNG, and was one until the end of the show. Worf was promoted again to Lieutenant Commander ⚪️⚪️⚫️ prior to the events of “Star Trek Generations” and retains that rank for his assignment on DS9, switching to the command division again and assuming the role of Strategic Operations Officer at the end of 4x01 “The Way Of The Warrior”, until the end of the show. Usually addressed as ‘commander’ on DS9.
Miles O'Brien: there is a whole subsection on Memory Alpha about O'Brien’s problematic rank history, but his rank on DS9 seems to be Senior Chief Petty Officer, and he is usually addressed as ‘Chief’. He was Transporter Chief on TNG, then promoted to Chief of Operations on DS9.
Odo: is usually addressed as Constable, but this is only a nickname since there’s no such rank in the Bajoran Militia (in which he is officially commissioned, although we don’t know which rank he was appointed). The title was first given him by Kira when the station was still under Cardassian administration, and eventually fell into common use as his unofficial title. Odo kept the title of Constable even after Cardassian forces withdrew from Deep Space 9. He has the role of Chief of Security aboard the station.
Rank matters a lot to me, a EFL fan, since Netflix subtitle honorifics are based on ranks. For example, no personnel on DS9 speaks casually to Kira except Sisko. Kira and Odo both use honorifics to each other. Bashir is O'brien’s senior officer and speaks casually.
For those without ranks, it gets funny. Bashir used honorifics to Garak in 1x03 (of course, they are strangers) but at Garak’s second appearance a year later, Bashir’s speech is suddenly impolite. And Garak, ever polite, almost always uses honorifics to people with a few exceptions like Quark.
And I think Sisko and Dax tend to talk casually in impolite settings, but officially they also follow the rank rule.