Posted at Major Wolf's site, here.
One I would add, that is part deathly serious and part in keeping with Mr. Murphy: "Only two types of enemy will try to kill you from a distance or buckle-to-buckle - Amateurs and Stone Cold Professionals.
Murphy’s Laws of Combat
1 - Don't look conspicuous - it draws fire. (This is why aircraft carriers are called "Bomb Magnets")
2 - Try to look unimportant because the bad guys may be low on ammo.
3 - Anything you do can get you shot - including doing nothing.
4 - When in doubt, empty your magazine.
5 - If you are forward of your position, the artillery will fall short.
6 - If you are short of everything except bad guys, you are in combat.
7 - If your attack is going really well, its an ambush.
8 - No plan survives the first contact intact.
9 - Never share a foxhole with someone braver than you are.
10 - Never forget that your weapon was made by the lowest bidder.
11 - All five second grenades will burn down in three seconds.
12 - The enemy diversion you are ignoring is the main attack.
13 - The important things are always simple.
14 - The simple things are always hard.
15 - The shortest route is always mined.
16 - If the bad guys are in range, "SO ARE YOU ! ! !"
17 - Incoming fire has the right of way.
18 - Friendly fire - isn't.
19 - The only thing more accurate than incoming fire is incoming friendly fire.
20 - Tracers work both ways.
21 - Things that must be together to work, usually can't be shipped together.
22 - Beer math is: two beers times 37 men = 49 cases.
23 - No combat ready unit has ever passed inspection.
24 - Professional soldiers are predictable, but the world is full of amateurs.