Anything you do can get you killed - including nothing. The only thing more accurate than incoming enemy fire is incoming friendly fire. If you make it tough for the enemy to get in, you can't get out. If you take more than your fair share of objectives, you will be given more than your fair share of objectives to take. When both sides are convinced they are about to lose, they are both right.
Professional soldiers are predictable, but the world is full of amateurs.
Murphy was a grunt. Old Navy saying. The worst place to be standing in battle is next to a 2nd Lt. Always go into battle with a buddy. It give the enemy someone else to shoot at.