Hi, my name is Mario Castillo.
I spent 15 years in the military and I've done two tours overseas. My first mission was in Kosovo in 2005/6 and my second mission was in Iraq in 2009/10. On both missions, I was a combat medic attached to an infantry unit.

In 2015, while working for a hospital in Northwest Houston, a security guard told me that if she encountered an active shooter, she would remove her shoe and throw it at him in the hope that she would knock the gun out of his hand. She went on to say that she would then run as fast as she could away from the shooter. This upset me, of course. That night I spent about five hours creating the embryonic version of what I teach today. I spent the following six months enhancing that model.

It’s important to know how to survive an active shooter scenario without weapons for a couple of reasons. First, most organizations don’t allow their employees to carry guns. Consequently, my approach gives the unarmed individual specific tactical options used in combat zones around the world. Second, it may take quite some time for police to arrive on the scene. Therefore, I've designed my Training for Tactical Thinkers (T3) program so that individuals are not powerless while they wait on law enforcement.

T3 can be taught in four or eight hours. In both classes, we focus first on the strengths and weaknesses of both the shooter and the unarmed individual. The intention is to demonstrate how much power the unarmed individual actually has, contrary to popular thinking. We then teach movement as a strategy and a tactic. We discuss the importance of movement and what movement means as it pertains to survival in the active shooter scenario. We follow that with a discussion on leadership and being prepared for potential threats. The eight-hour class has a segment on radio communication and a practical exercise as well.