"The enemy is denial"

Dave Grossman’s “Five D’s.”
1. Denial — Denial is the enemy and it has no survival value, said Grossman.

2. Deter — Put police officers in schools, because with just one officer assigned to a school, the probability of a mass murder in that school drops to almost zero

3. Detect — We’re talking about plain old fashioned police work here. The ultimate achievement for law enforcement is the crime that didn’t happen, so giving teachers and administrators regular access to cops is paramount.

4. Delay — Various simple mechanisms can be used by teachers and cops to put time and distance between the killers and the kids.

5. Destroy — Police officers and agencies should consider the following:

a. Carry off duty. No one would tell a firefighter who has a fire extinguisher in his trunk that he’s crazy or paranoid.
b. Equip every cop in America with a patrol rifle. One chief of police, upon getting rifles for all his officers once said, “If an active killer strikes in my town, the response time will be measured in feet per second.”
c. Put smoke grenades in the trunk of every cop car in America. Any infantryman who needs to attack across open terrain or perform a rescue under fire deploys a smoke grenade. A fire extinguisher will do a decent job in some cases, but a smoke grenade is designed to perform the function.
d. Have a “go-to-war bag” filled with lots of loaded magazines and supplies for tactical combat casualty care.
e. Use helicopters. Somewhere in your county you probably have one or more of the following: medivac, media, private, national guard, coast guard rotors.
f. Employ the crew-served, continuous-feed, weapon you already have available to you (a firehouse) by integrating the fire service into your active shooter training. It is virtually impossible for a killer to put well-placed shots on target while also being blasted with water at 300 pounds per square inch.
g. Armed citizens can help. Think United 93. Whatever your personal take on gun control, it is all but certain that a killer set on killing is more likely to attack a target where the citizens are unarmed, rather than one where they are likely to encounter an armed citizen response.