The buddy system is essential to your survival -- it gives the
enemy someone else to shoot at.
Never share a fighting position with anyone braver than
yourself
Anything you do can get you shot, including doing nothing.
If you can't remember, then the Claymore is pointed at you.
The enemy diversion you have been ignoring is the main
attack.
If your advance is going really well, you are walking into an
ambush.
When you have secured an area, don't forget to tell the
enemy.
If it's stupid but it works, it isn't stupid.
If at first you don't succeed, call in an airstrike.
When in doubt, empty your magazine.