They had this on Qi a few years ago. It's a Hollywood myth that people fall over or get blasted backwards when they've been shot. Unless they hit the brain, heart or sever your spinal cord, the chances are that you'll still be able to move. In other words, still be able to run away as fast as you can.
Even if you get shot by one of the high velocity assault rifles that are issued to the majority of the worlds armies, the chances are unless it hits a vital organ you will survive. Military thinking being that if you wound a man you take him and the people who will be tending his wounds out of the battle, and then use up even more of your enemies valuable resources treating him whilst he recovers. They've had to rethink it in Afghanistan, and it's likely they will be changing back to a higher calibre round.