Anything specifically required, besides a bachelors degree, in order to transition branches and commission in the Army as an FA?

There's no guarantee what branch you'll get. You'll have to go to OCS, the Army doesn't do direct commissions except for JAG, chaplain, and medical.

That is the single most limiting factor, but only one of a number of prerequisites. Talk to an Army recruiter. They can give you more answers on service to service transfers and commissions. Not many on here will be able to provide the current policies and procedures with much confidence.

Not that it esp. matters other than purely out of interest, I'd just wondered, how did you happen to settle on wanting FA? It's obviously fine, of course, certainly, I merely found your specific interest in that explicit branch interesting, that was all, if you might care to elaborate on that aspect at all...also, have you gone masters or Ph.D. level yet at all, or given any thought to that? I only ask, as, I can assure you as well, all services, for all warrants and commissioned, will virtually automatically insist on your getting, minimum, a masters, virtually from day one, trust me, been there, done that (BTDT)...as I'd said, you being USAF enlisted will obviously help you considerably, I'd just be most eager to hear more, as I found your specific question and preference of quite genuine interest, as I'd said, I hope all that was of use, if I find anything else I was thinking might be of similar interest, I'll try to send that, as well, OK?