Starfleet personnel are UESPA personnel.
A baseless statement. Starfleet personnel in all the episodes are Starfleet personnel, nothing more, nothing less.
That EUSPA existed then shows that United Earth government existed in some form that early.
...Not even that much. Earth isn't united today, yet organizations named "United Earth Thisorthat" abound. Heck, even a quick googling reveals three organizations specifically named "United Earth"!
For all we know, UESPA was a purely commercial, purely US organization akin to SpaceX. And remained so through the centuries, even if the definition of "commercial" gradually evolved a bit.
UESPA had its own military, the Starfleet.
...Just like NASA today has its own mililtary?
The whole concept is so absurd that it's not worth pondering at all. Many weapons designing and manufacturing corporations today vitally depend on warfare, and basically have governments in their back pockets to conduct the warfare for them, yet even
they don't pretend to "own" or "command" the USN or the USAF or anything like that. Nor do they have their own militias, mercenary fleets or other terrorist organizations.
Yeah, but it very clearly was portrayed as non-combat-oriented, at least where NX-01's overall crew was concerned (Reed and his security people being the exceptions).
But the point of the show is that our heroes are the exceptions. They are the first of their kind, in an organization that predates them by decades. What did that organization do before it gained its first-ever exploration vessel - play peacegames?
Not so, as our very first exposure to Starfleet vessels other than Archers shows them in combat, using armaments superior to what Archer originally was provided with, and defeating a Klingon warship.
And really, who would they have fought?
The same threats the civilian Earthlings did, for starters. Not with any great success if their best combat vessels puttered along at warp 3.14159 or whatnot, of course. But you have to start somewhere.
At most, Starfleet would've been along the lines of the Coast Guard -- more just patrolling local waters and doing police or rescue work than getting involved in serious conflict.
And that's what most navies in history, and presently, do. That, plus their morning prayers that this state of affairs would continue.
Even if UESF desperately wanted to be tangled up in a war, this might have been difficult to arrange. It does not follow that UESF would not have been a space combat force either primarily or exclusively.
Timo Saloniemi