Evan Marshall is a Special Weapons and Tactics trainer for a federal agency with counterterrorist responsibilities. He retired from the Detroit Police Department after 20 years of service. His assignments included Tactical Unit, Crime Scene Investigation, Homicide and the Special Response Team. He has trained groups as diverse as the Federal Air Marshals and the U.S. Army Special Reaction Team. His articles on ammunition, ballistics and tactics have appeared in the law enforcement and firearms press over the past 25 years.