US Marine Corps Rules for Gun fighting
1. Bring a gun. Preferably, bring at least two guns. And bring all your friends who have guns, too.
2. Anything worth shooting once is worth shooting twice. Ammo is cheap; life is expensive.
3. Only hits count. The only thing worse than a miss is a slow miss.
4. If your shooting stance is good, you're probably not moving fast enough nor using cover effectively.
5. Move away from your attacker. Distance is your friend (lateral and diagonal movement are preferred)
6. If you can choose what to bring to a gunfight, bring a gun. Long guns and friends with long guns are preferred.
7. In ten years no one will remember the details of caliber, stance, or tactics. They will only remember who lived.
8. If you are not shooting, you should be communicating, reloading, and running.
9. Accuracy is relative; most combat shooting standards will be more dependent on "pucker factor" than on the inherent accuracy of the gun. Accuracy declines proportionally as pucker factor increases.
10. Use a gun that works every time; all skill is in vain when an angel pisses in the flintlock of your musket.
11. Someday someone may kill you with your own gun, but they should have to beat you to death with it because it is empty.
12. Always cheat, always win. The only unfair fight is the one you lose.
13. Have a plan before going into the gunfight.
14. Have a backup plan, because the first one never works.
15. Use cover and concealment as much as possible.
16. Don't drop your guard (or your grenade).
17. Always tactically load and threat scan 360 degrees.
18. Watch their hands; hands kill ("In God we trust...everybody else keeps their hands where I can see them")
19. Decide to be aggressive ENOUGH, quickly ENOUGH.
20. The faster you finish the fight, the less likely you are to be shot.
21. Be polite. Be professional. Have a plan to kill everyone you meet.
22. Be courteous to everyone and friendly to no one.
23. Your number one option for personal security is a lifelong commitment to avoidance, deterrence, and de-escalation.
24. Do not attend a gunfight with a handgun, the caliber of which does not start with a "4" or higher.
25. When in doubt, call in an air strike.
26. Do not eat the Claymores.
US Navy Rules for a Gunfight
1. Go to sea
2. Send in the Marines
3. Drink coffee