Apollo wrote:
And it doesn't require you to role play back any more than you usually do with a green beret on your head calling yourself "Major".

You could apply that logic to any game - you could say that in Alien versus Predator you are role-playing as either an Alien or a Predator. The difference is that when playing as an Alien (or Predator) I'm not trying to sound or act like one, I'm just using it as an avatar to represent myself. I've never referred to myself as a Major or expected anyone to call me a Major for this very reason (compared to some other units that like to do this).
Maybe it's just me, and I know this sounds a bit contradictory, but role-playing in Arma breaks immersion for me (personally). However, if other people enjoy a bit of RP on the public server then that's great.
Chris I would just like to point out that I really enjoyed reading your post and I'm looking forward to reading more