In fact, I am now reminded that in the entire history of Trek, it's been all but openly stated that Starfleet has almost no permanent presence on Vulcan in the first place (the Vulcans, having recently found out they are pacifists, don't have a fleet of their own).
The same is true of Earth, though. There don't appear to be any permanently positioned starships there in peacetime, and even in the middle of heated war most of these ships find much better things to do than hang around Earth.
Apparently, keeping fleets within star systems is unwise for some reason. It's never done in peacetime, and it seems it's seldom done in wartime, either. In the former case, there might be contrary political pressures; in the latter, the forces might be better used operating at some distance to provide depth of defense. The end result is clear, though: Starfleet is not a sessile force, in terms of starship deployments.
Fixed fortifications are a different thing - we never saw if Starfleet operates something comparable to Chin'toka, but we did hear of fixed defenses at Betazed and previously at Earth, Mars and Jupiter. Things would probably make better sense if such potent fortifications indeed were commonplace, and the fortress troops might indeed be heavily "ethnic", then. But we haven't properly seen that element of Starfleet yet.
There's no indication they were tasked with protecting Betazed at all. It's just as likely they were the only task force within range to reinforce the Betazed after they were defeated.
As per the quotes, the same argument should apply to the 3rd Fleet vs. Earth...
Is Bajor a general assignment? Or are there some undisclosed historical/economic/political ties between Earth and Bajor?
In theory, there might be. But none seemed to play a role in the last bit of local nastiness before the show, as Starfleet apparently didn't lift a finger to help Bajor out of Cardassian rule while otherwise fighting the Union.
Or is it simple proximity; it is apparently possible to make the Earth-Bajor run at Warp 8 in about four days.
Distance to, say, Vulcan or Andor would be pretty much identical. And we've never heard of a division of labor in the defense of the Federation, not as regards its inner assets, not as regards its more distant ambitions. Starfleet fights near Earth, defends the Romulan border near Vulcan, has ambitions towards Bajor, is the only force ever referred to as standing between the UFP and the Klingons or the Breen or the Tholians... It's very difficult to argue that they could be so self-centered as to forget to mention other major or even moderate contributions.
What are the odds that Nazis or Allies in an average WWII movie would forget to mention Italy, even if in the sense of "they aren't contributing much"? Perhaps 50% or so. But we aren't watching a movie - we're watching close to a thousand hours of material. The complete absence of references to Starfleet's "colleagues" or "competitors" is utterly implausible there.
...with Bajor's almost legendary pride, I severely doubt they would submit to turning in Bajoran uniforms, weapons, equipment and customs for those of an alien race they have only known for a handful of years.
In which case the UFP gives them the finger and tells them to try again in a century or so, when they have learned to behave. Starfleet Vulcans aren't seen wielding lirpas or walking in aluminum miniskirts much, now are they? Who knows, perhaps humans also were told to ditch blue or green coveralls and shoulder patches and hats and ceremonial swords and gunpowder sidearms and hand salutes, on the pain of exclusion from Starfleet?
And yet we rarely saw colonies whose populations were composed primarily of non-humans. The most likely explanation is that Enterprise, like all ships in the Earth branch, placed supervision and patrol of Earth colonies as one of their priorities.
That was the unvoiced premise of TOS, yes. And Kirk's ship seldom responded to acute colonial crises at all, perhaps because of problems with reaction time - so their colonial visits could all easily have been on a preplanned human-biased schedule.
We could just as easily agrue, though, that humans are virtually the only UFP members out there who happen to be in a colonizing phase right now. Older cultures might be satisfied with what they have already, and their people would have no internal pressures for an exodus. Younger cultures might be too timid. So it's just the crazy humans who colonize, or join Starfleet.
Either possibility separately, or both jointly, would help explain away the obvious bias towards humans in Star Trek. But neither should be used for worsening the problem, by implying that there are even less aliens in the mix than shown. Mixed crews and colonies are portrayed whenever the budgets allow; this effort should be supported, not opposed.
Back to the Vulcan situation:
It is implied in Amok Time, Gambit, and STXI, all three instances would have rendered the prevailing situation immensely silly if a Starfleet base (with its own contingent of vessels) existed in orbit of the planet.
But bases don't tend to have contingents of vessels, from what we see. Even bases at military hot spots are hard pressed to pull together two dozen ships of which half are truly operational. Earth doesn't tend to have contingents of vessels, either.
What in STXI would have been different if Starfleet had a major presence at Vulcan? Nero would still have wiped it out and effected a communications blackout.
What in "Gambit" would have been different? Should Picard have gone through some sort of Starfleet bureaucracy before being allowed to beam down in hunt of the pirates and agents targeted by his undercover mission? Should local Starfleet ships have come to blast Baran's ship out of the sky? Should local Starfleet police have stormed the caves?
If Starfleet were present on Vulcan, they'd have known to stand aside. If Starfleet weren't... Now there we would have had problems, as then Vulcan authorities would not necessarily have known to stand aside.
And Sela stops just short of stating this outright, since the entire "using civilian ships to land invasion troops" plan depends on those troops being able to capture and hold ground and then fortify their positions before Starfleet forces could arrive to dig them out. That plan goes all to hell if a Starfleet presence is already there that can stamp out the invasion before they can go anywhere.
Yet the episode establishes that there are Vulcan defense vessels responding to the threat, once it is recognized. Sela would have known this, too; her calculations would not have hinged on the absence of defenses.
What the episode doesn't establish is that the defense vessels would be anything else than generic Starfleet.
The same also occurs in STXI, where Nero has no trouble at all pulling into orbit of Vulcan and drilling holes in the planet, but apparently needs to get the access codes to the defense system to pull the same trick on Earth.
What makes you think he didn't need or have access codes to Vulcan? He had a simple means of obtaining such codes, and it seemed to work just fine in case of Earth. And he had certainly demonstrated that starship fleets, regardless of their ethnic nature, were no hindrance.
Unless it was known the 10th fleet was in the area and Starfleet thought that angle was well covered.
A situation identical with the 3rd Fleet vs. Earth, then.
Although the dialogue is specific in that the 10th was caught outside the Betazed system, meaning it was supposed to be inside the system.
Given the ease with which a Ferengi marauder can abduct people from their planet, it does not seem that Betazed is a major Starfleet post either.
Nor is Earth. A Ferengi Marauder can surprise the Moon into panic, as in "Descent". And our heroes and villains secretly come and go to and from the Klingon and Romulan homeworlds as they please; in "Menage a Troi", Daimon Tog didn't need to sneak in or out or anything, he just publicly sailed out with two forcibly beamed-up passengers aboard.
The idea of a "major Starfleet post" just doesn't seem to exist. There are starbases where dozens of ships temporarily receive maintenance, repair and overhaul, but none is known to lie close to a major UFP planet. And then there are major UFP planets where Starfleet has representatives and surface and orbital installations but no known permanently positioned starships.
I'd agree that the Bajoran Militia might still exist and function within the Bajoran system
I'd actually dispute even this - as we have never heard of such an arrangement before. There are no local militias or even police forces in evidence anywhere within the UFP. The known "ethnic" contribution of the ancient and proud Vulcan culture to their own defense or policing is an intelligence agency, a bunch of paper-pushers. And as "Gambit" shows, Starfleet actually does even this work for them...
...invalidating the references to the Enterprise as a United Earth ship in early TOS.
All the more easily done because there were no such references!
Apart from the second pilot episode, the only "Earth ships" mentioned in TOS by our heroes were Mudd's vessel, and the vessels Spock wanted to warn of Balok in "Corbomite Maneuver".
Of course, aliens would speak of Earth even when they meant the Federation, just like Germans spoke of England when they meant Great Britain plus the Polish, Norwegian, French etc. refugee governments. And even Spock could be considered a foreigner in this context: he kept on considering mankind an "Earth" thing, referring to "Earth" emotions and practices and stains in history whenever he meant mankind. So his "Earth ships" in "Corbomite" could be dismissed on this basis, leaving just Kirk's single "Is Mudd's ship an Earth ship?". And Kirk might well have had a solid practical reason of asking that specifically, rather than "Is Mudd's ship a Federation ship?".
Even in "Where No Man Has Gone Before", where Kirk muses that there might have been "another Earth ship" before them at the galactic barrier, his choice of words is perfectly defensible. If that other, ancient ship is a human one, then it must automatically be an Earth ship, not a Starfleet or Federation ship. Doesn't mean that Kirk's own ship would have to be considered an "Earth ship", despite the use of the specifier "another".
Starfleet culture is naturally going to be a very different kind of operational culture than any of the worlds its officers come from; that's why you get four years of Academy training: To break you of your native culture and rebuild you into the Starfleet operational culture.
And that seems to work just fine for Vulcans and Andorians in Starfleet. And for Bolians and Bajorans and Klingons and Ferengi and whatnot. Just because we haven't seen a Tellarite in uniform (or did we, in the movies?) doesn't mean Tellarites would need specially constructed ships. After all, we haven't seen such ships, either - it's two cases of absence against each other.
It makes no sense that independent races that only recently MET each other, who do not even share the same planet together, would begin to associate themselves primarily as members of an interplanetary superstate and not first and foremost as members of a species that has many allies.
In that case, the races may remain independent. The UFP and Starfleet have many allies: Klingons, and lately Romulans and Cardassians. They also have many members: Vulcans, Andorians, Tellarites. The two sets of cultures made two different types of choice. Some allied, others joined. Both have to pay a price for their choice.
So what? Earth is the capital planet of the Federation. That doesn't mean that Starfleet owes any more special loyalty to Earth because it's Earth; they'd react the same way if the Federation capital planet was Vulcan or Andor or Deneva or Delta or Bolarus.
And here again "Earth" is prefectly valid shorthand for "the Federation". If the region of Earth is left poorly defended, this means the Federation is left poorly defended, because Earth, Vulcan, Andor, Tellar, Berengaria and so forth all supposedly lie in the same area, as seen from the distant Bajor at least.
Timo Saloniemi