Okay, anybody got the exact wording of Scotty's memorized? "The first Earth ship to reach warp four"?
I was also thinking that Edison may have served on the NX-01, since I don't think there was any other opportunity for a MACO to fight a Xindi.
As per "The Slaver Weapon", there were four Xindi wars. The last may have been the one in ENT S3, with the first three only retroactively recognized as the doings of the same multispecies bunch of heavies (of which the feline Xindi were among the nastiest)...
The only problem with the theory you guys are all going for is that in the TV series ENT, it sounds like there was no intermediate step between the warp 2 engine and warp 5 engine.
That's not what "First Flight" tells. There was no warp 2 engine in that episode - only a warp 5 engine that went through several prototyping stages, achieving various speeds at various stages. Nothing there indicated that Robinson should have been the first human to travel faster than warp 2, only that he happened to hit that speed with that engine - without
any mention of this being a record. (Instead, the one record he made was being the first person, supposedly with the definer "from Earth" attached, to launch an escape pod at warp!)
Freighters not yet having warp 4 engines is not all that interesting, because they
still don't have anything better than warp 2 in TOS "Friday's Child"...
And it was definitely an Earth ship which was transferred to the Federation Starfleet upon the formation of the Federation. Scotty called it an Earth ship, and then records show that Edison was given command of it after MACO had been disbanded.
But the TOS NCC-1701 was also an Earth ship in addition to being a Federation Starfleet vessel, so that doesn't really tell us much.
Whether the
Franklin predated the UFP Starfleet or not remains open to debate. Her armaments surprisingly include "spatial torpedoes", a weapon that might not get installed aboard a ship built after the formation of the UFP because it had proven impotent in the 2150s already and at least accompanied if not superseded by the photon(ic) torpedo in that timeframe, too.
The question is, why did it still have an NX prefix? Shouldn't it be NCC instead?
Not if she's experimental when she serves in the UFP Starfleet. It's not as if the other known NX-designated ships in the UFP SF would have been quick to shed their experimental status.
Why would they give a ship to a MACO soldier in the first place?
Why not? Some of the MACO in ENT S3 showed proficiency in operating the hero starship, suggesting they were veterans of that sort of stuff. The US Army has ships today - the people operating those might see Navy service in certain fictional circumstances.
Timo Saloniemi