My theory is, it depends which sector you scout first in the Taking Botuku quest. If you scout Kalayube first, you'll get Old Acquaintance. I've asked quite a few friends and so far nobody has a counter-example.Is "Old Acquaintance" a story quest? Exoskeletons are not as cool as hovers, of course, but I would not mind Exos in Colonial, lol. But... if the only way to get FE (or even TE troops) is via story quest, then my hope for those troops while I am in CA is that I can trigger a story quest to take one of my RQs, something only reported for folk in Indy and above.
There's a blocker in Progressive that I don't think anyone has found a way past yet. You need Police Stations to progress the story.
It's possible to get ME/TE units from side quests, but as far as I know these simply don't trigger in CA. I tried to trigger the ME quest Rin Gozen's Warriors when in CA, but it didn't come up.