So, what would (in-universe) be a good rank structure aboard Voyager?
Let’s agree that Kim is LTJG by 2373/74.
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That's reasonable, based on other known examples it takes between 1 and 6 years, with an average of 3.
Kes wears science blue and is an un-ranked crewman/crewperson. (Like she did in the Star Trek: Trexels video game).
Other NCOs wear the O’Brien-style insignia from DS9.
Kes should probably
start as a "crewman", but by the time she's essentially a nurse or at least "corpsman" she should be an NCO. Some greater variety of NCO insignia would be nice. In fact, now I think about it, one possible reason for the Carey vs Torres debate in this setting could be that any
experienced commissioned engineers were killed in the transit and he was the "Chief of Engineering" who Janeway was going to promote from (Senior) Chief to Lieutenant.
The Doctor has been granted an NCO rank and insignia, given that he serves as actual senior staff full time.
Additionally, Voyager hires medical personnel on a temp/contract basis, with the caveat that they might suddenly be whisked to Earth if Voyager got the chance to return home instantly. Imagine a Talaxian doctor or nurse, for instance.
IMO, you really have to make The Doctor a commissioned officer if you're going to change it, otherwise you're invalidating your own premise as MDs are
never NCOs.
Tuvok still becomes LTCDR.
Sure.
The ex-Maquis that are doing well receive official pips.
I'd expect most of them to be made NCOs rather than officers, but I don't object in principle.
By 2376/77, Seven of Nine wears science blue, unranked, over her dermal sheath suit.
Yes to "science blue", similar to The Doctor, I think making her a Lieutenant makes more sense, and roughly corresponds to her position in the "chain of command" as she (mostly) recognises Janeway, Chakotay and Tuvok's authority, but mostly puts herself above the lieutenants.
Torres earns her LTCDR.
Kim becomes LTCDR.
I'd say Torres to LCDR is possible, we have examples of talented officers (LaForge, Worf) making it from LTJG to LCDR in that sort of time, but the only example AFAIK of someone making it from ENS to LCDR that quickly is Will Riker, whose career appears to have been to a degree accelerated by politics and backhand deals arising from his silence over the "
Pegasus Incident" and his father's contacts, as his time to LCDR (~ 4 years) is well outside the averages suggested by Data in
Datalore and roughly half the time of others.
On the other hand, there's enough variation in the datapoints for LT that I wouldn't object to him getting his second silver pip.
Chell is part-time chef, apprentice to Neelix, who runs the nursery/school for the ship’s ten or so children. Stable partnerships had been encouraged to raise a replacement crew on the initially 60-year, then 30-year journey.
Seems reasonable.
By the time of Endgame (2404), the Doctor would be a commander.
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That would make sense if we're making him a Lieutenant (or JG) initially, but not if we're starting him at CPO in the
same role.
Side note, in the non-canon VOY novels set after the ship’s return home, almost everyone is promoted two steps in rank to make up for the time in the Delta Quadrant, except Tuvok (1 promotion), Janeway (vice admiral) and Doctor (gets nuttin’).
Actually, it was mostly the senior staff were promoted, plus a couple of junior staff who were moved up to replace departing senior staff.
Janeway was promoted to Vice Admiral [three grades]
Chakotay was initially promoted to (substantive) Commander, then later Captain [two grades].
Tuvok was promoted to Commander [one grade].
Paris was promoted to LCDR [two grades].
Torres was promoted to LCDR [two grades].
Kim was promoted to LT [two grades] <-- replaced Tuvok as Chief Tactical Officer and Second Officer.
Wildman was promoted to LT, and then LCDR on her next assignment [three grades].
Vorik was promoted to LT [two grades] <-- replaced Torres as Voyager's ChEng.