1. If the enemy is in range, so are you.
2. Incoming fire has the right of way.
3. Don't look conspicuous: it draws fire.
4. The easy way is always mined.
5. Try to look unimportant; they may be low on ammo.
6. Professionals are predictable; it's the amateurs that are dangerous.
7. The enemy invariably attacks on one of two occasions:
When you're ready for them. When you're not ready for them.
8. Teamwork is essential; it gives the enemy someone else to shoot at.
9. If you can't remember, the claymore is pointed at you.
10. If your attack is going well, you have walked into an ambush.
11. Don't draw fire; it irritates the people around you.
12. The only thing more accurate than incoming enemy fire is incoming friendly fire.
13. When the pin is pulled, Mr. Grenade is not our friend.
14. If it's stupid but works, it isn't stupid.
15. When in doubt empty the magazine.
16. Never share a foxhole with anyone braver than you.
17. Anything you do can get you shot. Including doing nothing.
18. Make it too tough for the enemy to get in and you can't get out.
19. Mines are equal opportunity weapons.
20. A Purple Heart just proves that were you smart enough to think of a plan, stupid
enough to try it, and lucky enough to survive
21. Don't ever be the first, don't ever be the last and don't ever volunteer to do anything.
22. The quartermaster has only two sizes: too large and too small.
23. Five second fuses only last three seconds.
24. It is generally inadvisable to eject directly over the area you just bombed.

These were originally known as "Murphy's Laws of Combat Operations" from wayyy back! lol derf

Some others from Murphy's Laws of Combat:


Friendly Fire -- Isn't!
The important things are always simple.
The simple things are always hard.
The enemy diversion you are ignoring is the main attack.
When you secure an area, don't forget to notify the enemy.
No combat ready unit has ever passed inspection.
Radio's will fail as soon as you need fire support desperately.
Tracers work both ways.
No plan survives the first contact intact.
Things that must be together to work, generally can't be shipped together.