I've noticed that while driving vehicles, your passengers, whether AI or human, sit there with no expression on their face/body, only having the occasional blink. It would be nice to see some animations such as covering the head whilst under fire, or just moving a little while idle, instead of staring indifferently into space while their surrounding squad mates are blasted into oblivion. These animations would probably be best in vehicles like Humvees and other light vehicles, where it's more dangerous/open, as opposed to an APC or Chinook. This would also go nicely with the open vehicles feature, where you could walk around the larger vehicles (C130, etc...) as it moved.