I appreciate this game's throwback to BF with US and RU, don't get me wrong. In the grand scheme of things it's just a flag on the uniform and I think the undershirt changes.
I just feel like it's a missed opportunity when you "lock" factions like this. I'd actually like to see them removed. Make the teams nondescript. Friendlies vs. Opfor or something. Let us have a little custom emblem instead of a flag, maybe.