 He described this system as primarily based on his personal experience, which according to police records included some 600 non-training fights, by his retirement at age 55 from the position of Assistant Commissioner in 1940.In 1951, he went to Cyprus to train police and in 1952 (and 1956) Fairbairn provided training to the Singapore Police Force's Riot Squad unit, which is now Police Tactical Unit.Together with Eric A. Sykes, Fairbairn developed innovative pistol shooting techniques and handgun specifications for the SMP which were later disseminated through their book "Shooting to Live With the One-Hand Gun" (1942), along with various other police innovations such as riot batons, armoured vests, and other equipment.