Places that advertise “gun free” and don’t have clear signs of surveillance are at heavy risk. Most of the mass shootings and active shooters that make the news attack vulnerable or soft targets. The easiest way to plan for an active shooter is to make your location difficult to hit. That doesn’t mean you need to sandbag the walls and get a gunner up in the turret of your Humvee. It just means making it visually clear that if someone decides to commit violence – he or she will be met with fierce resistance.