On a lighter note . . .

MURPHY'S COMBAT LAWS

1. You are not a superman.
2. If it's stupid but it works, it isn't stupid.
3. Anything you do can get you shot - including doing nothing.
4. Don't look conspicuous - it draws fire.
5. Try to look unimportant because the bad guys may be low on ammo.
6. Never share a foxhole with anyone braver than you are.
7. When in doubt, empty your magazine.
   
8. Never forget that your weapon was made by the lowest bidder.
9. Things that must be together to work, usually can't be shipped together.
10. Radios will fail as soon as you desperately need fire support.
11. All 5 second grenade fuses burn down in 3 seconds.
    
12. No plan survives the first contact intact.
13. If your attack is going really well, it's an ambush.
14. The enemy diversion you are ignoring is the main attack.
15. If you are forward of your position, the artilary will fall short.
    
16. The important things are always simple.
17. The simple things are always hard.
18. The easy way is always mined.
    
19. If the enemy is in range - SO ARE YOU!
20. Tracers work both ways.
21. Incoming fire has right of way.
22. Friendly fire isn't friendly.
23. The only thing more accurate than incoming enemy fire is incoming friendly fire.
    
24. When you have secured an area, don't forget to tell the enemy.
25. Make it tough for the enemy to get in and you can't get out.
26. If you take more than your fair share of objectives, you will have more than your fair share of objectives to lose.
    
27. When both sides are convinced that they are about to lose, they are both right.
28. If you are short of everything except enemy, you are in combat.
29. Professional soldiers are predictable, but the world is full of amateurs.
30. No combat ready unit has ever passed inspection.
31. Murphy was a grunt.

Adapted from Half Life - Opposing Force