Dave Grossman, a retired U.S. Army lieutenant colonel and Ranger, travels the country teaching law enforcement officers and military personnel about the psychological and physiological effects of combat and preaching a contemporary version of the warrior code. Dave Grossman is a psychology and military history professor who has authored three books: “On Killing”, “Stop Teaching Our Kids to Kill”, and “On Combat.” His writings and research have made him one of the most in-demand speakers in the country. Grossman’s constant contact with police officers who have been forced to kill in the line of duty led to his writing. This article presents an exclusive interview of Dave Grossman with Police Magazine editor David Griffith in which he discussed the role of the warrior in society, the effects of killing on police officers, and how officers can protect themselves from psychological injury in the aftermath of armed combat.