Rule #1:
Don't get shot.

Rule #2:
Short, controlled bursts.

Rule #3:
You discovered what it is.

Rule #4:
Watch your bullet drop.

Rule #5:
Patch your wounds.

Rule #6:
Keep a full mag.

Rule #7:
If in doubt, fall back.

Rule #8:
Keep the enemy supressed.

Rule #9:
Orders.

Rule #10:
Beware of confined spaces.