[citation][nom]theuerkorn[/nom]It might train your reflexes, but it also trains you to be more tolerant towards violence. What you do with that is your choice, but last thing I would want is a smarter criminal. (I know, it's a gross oversimplification, but still.)[/citation]
We are better at killing people then previous generations. So if we have a major war, we are all set to pwn the enemy. Remember the ridiculously high percentages of soldiers who were shooting high back in Vietnam. I know for sure that I wouldn't be shooting high. We are competitive when it comes to killing people and the military loves that.
Games are also a big advantages when it comes to battlefield UIs like active maps or shooting through a monitor.