Denver, its just a mind-controlled set. You are controlling ur finger, not keeping your finger at distance for "in case shit happened". And barrel-up position is just enough to be safe.
Of course all-american field manuals will teach soldier to walk through a forest aiming in following direction. And "swat" members holding each other by shoulder and walking like freaking scolopendra in order "to let everyone feel" that someone's right behind you. WTF!!! I've never seen so much dumb-ass-ity.
Seriously! Do they practice goos-walk in synchronical movement too?
And btw, how do American Army personnel checking their combat laptops for the Internet connection?