The Combat Conditioning Manual (Jiu-Jitsu Defense) was developed by R. E. Hanley in order to instruct and prepare troops for engaging the enemy in World War II. First printed as a pocket reference guide for Marine students of Jiu-Jitsu Defense it was later developed into an edition for the general public. In the author's own words . . . "this book was created only to help men when they're 'fighting for keeps'."An invaluable edition to any martial arts collection filled with various Jiu-Jitsu techniques as well as military based hand-to-hand combat techniques.