Jim Wagner is a former police officer, a jail guard and a flight security officer. In this, his first book on this subject, Wagner teaches you police ground fighting, security chokes and holds, martial arts in the war against terrorism, and a lot more. Wagner was a former Sergeant with America's Fifth Largest Sheriff's Department specializing in counter terrorists. Defensive Tactics consists of 206 pages by one of the best instructors in the world and covers a lot of material. This book serves as a basic guide to Wagner's approach to self-defense for both professionals and civilians. Some of the topics also include police and military knife defenses, the fighting system of the U.S. Military, self-defense in the skies, the psychology of combat, police ground fighting, the color code system, police and security chokes and holds, defense and numerous other topics. In conclusion, this is an excellent book for anyone interested in practical and reality based self-defense.