Don't ever be the first, don't ever be the last and don't ever volunteer to do anything. If your positions are firmly set and you are prepared to take the enemy assault on, he will bypass you. If your ambush is properly set, the enemy won't walk into it. If your flank march is going well, the enemy expects you to outflank him. Density of fire increases proportionally to the curiousness of the target.
Odd objects attract fire - never lurk behind one.
The more stupid the leader is, the more important missions he is ordered to carry out. There is always a way, and it usually doesn't work. Success occurs when no one is looking, failure occurs when the General is watching. The enemy never monitors your radio frequency until you broadcast on an unsecured channel. Whenever you drop your equipment in a fire-fight, your ammo and grenades always fall the farthest away, and your canteen always lands at your feet.