Imagine first responders arriving on the scene of an all-too-common active shooter emergency. The area is chaotic, people are injured and trying to flee, and there is disorienting noise and smoke as police try to secure the area.

The first responder’s job is—as it always has been—to provide critical care to victims. However, responders are more and more often entering still-hostile environments where bullets may yet fly, or planted homemade bombs could explode at any time.