GALLERY: Active shooter training

An instructor for the active shooter training cuts an actor's paints to show a fake wound he made on her leg. Each of the seven actors at the training had multiple fake wounds applied to make the situation more realistic. (Desiree Bauer / Tribune)

Before each active shooter scenario started, instructors talked actors through what their injuries were and what kind of responses they should give. (Desiree Bauer / Tribune)

A first responder arrives at the scene for the first active shooter training session, taking down the shooter and calling for backup to help the victims. (Desiree Bauer / Tribune)

First responders had to handle multiple victims at once, assessing who needed medical attention first and applying the aid that they could until EMS arrived. (Desiree Bauer / Tribune)

Even though the victims had fake wounds, each first responder had to dress those wounds as they would in a real situation. Instructors of the training stood nearby, answering questions and making sure responders handled the injury correctly. (Desiree Bauer / Tribune)

Just as they would in a real situation, EMS first responders carried victims with injuries prohibiting them from walking out of the building. (Desiree Bauer / Tribune)

To make the training safer and prohibit real injuries, actors walked up the stairs and into the ambulance instead of the first responders carrying them. The ambulance did drive away, but for most scenarios, it just looped around the block. (Desiree Bauer / Tribune)