you know, if you made a helmet with that new voice typing sofware from microsoft you type letters, and if you needed a stealthy way of talking just put moldable ear phones in the helmet, as for the other options, i'll get back to to you
oh i got the tageting recktical figured out. build a mounting device that can be adapted to any barrel and attach a small webcam and put a crosshairs in the middle of the helmet face plate then, have the webcam feed shown on your helmet face plate but do it so that you can still see your normal head vision. i'll get back to you with other details, later.