The Royal Air Force, Canada (RAFC) was formed in 1918 and an Assistant Provost Marshal was appointed in Toronto on February 1 of that year. Initially, there were approximately 30 Royal Air Force NCOs and airmen on his staff. This number was soon increased to 50, and two officers were appointed as Deputy Assistant Provost Marshals. The Royal Canadian Air Force Police had its beginnings in March 1940 when Group Captain M.M. Sisley was appointed as the first Provost Marshal of the RCAF. Originally called the Guards and Discipline Branch, the name was changed a year later to the Directorate of Provost and Security Services (DPSS). The DPSS was subdivided into two branches: Police and Security. These branches supplied gate and perimeter security for airfields and installations, and conducted disciplinary patrols. During the Second World War, RCAF Police were known as RCAF Service Police (SP).