FracGod

-Bring a gun. Preferably, bring at least two guns. Bring all of your friends who have guns.
-Anything worth shooting is worth shooting twice. Ammo is cheap. Life is expensive.
-Move away from your attacker. Distance is your friend. [Lateral and diagonal movement are preferred.]
-If you are not shooting, you should be communicating, reloading, and running.
-Always cheat; always win. If you walk away, it was a fair fight. The only unfair fight is the one you lose.
-Always have a plan.
-Have a back-up plan, because the first one won't work.
-Don't drop your guard.
-Always tactical load and threat scan 360 degrees.
-Decide to be aggressive ENOUGH, quickly ENOUGH.
-The faster you finish the fight, the less shot you will get.
-Be polite. Be professional. But have a plan to kill everyone you meet.

USMC Rules of Engagement.