Bingowings said:
Maybe the medical droid is just chatting to Luke about the evacuation to make him feel better and to check he is fit enough for flight duty (he did take quite a bump to his head recently and behind the wheel of a snowspeeder he could be more dangerous than useful if he hadn't sufficiently recovered).
It makes more sense than having a surgeon and a nurse droid in a military briefing as in ROTJ (it's stretching things having that fussy uncamouflaged protocol droid on the Endor raid, even if he did later become useful and they must have better and more portable military scanners than a loud and very visable astrodroid).
There are military protocol units. They're charged with quartermaster duty and procurement. M-3PO units also know all military regs which at this point in the Rebellion they're loosely obeyed... =D
Yes, a shiny gold droid really does kinda take away from commando level insertion into enemy territory. ^^