Dominion Police
The Dominion Police, although the federal police of Canada, was mainly active in the Eastern Canada region, while the Royal Northwest Mounted Police handled the expansive and sparsely populated Northwest Territories of Western Canada. In May 1918, the 969-member Dominion Police was reassigned under the Department of Militia and Defence and became a civilian wing of the Canadian Military Police Corps (CMPC). In the early 1900s, the Royal Northwest Mounted Police had declined as the Northwest Territories was divided into new provinces and territories, and due to the general unpopularity of the force for conduct during industrial disputes such as the Winnipeg General Strike. On 1 February 1920, the civilian members of the CMPC, including the Dominion Police, were merged with the Royal Northwest Mounted Police to form the Royal Canadian Mounted Police as the new federal police force of Canada, and the CMPC was disbanded on 1 December 1920.
Canadian Forces Military Police
The first embassy to employ MP personnel as Military Security Guards was Beirut, Lebanon in 1976. The Military Security Guard Unit (MSGU) was declared an official unit of the CF in 1990, and was officially renamed the MPSS in 2009.Originally established as one of several military detention centres, the CFSPDB, located at CFB Edmonton, is now the sole, permanently established military corrections facility remaining in the CF. The roles of the CFSPDB include: provide imprisonment and detention services for Canadian Forces service detainees, service prisoners and service convicts; to adjust detainees and prisoners to service discipline, and prepare them to resume an effective role in the CF; to return prisoners to civilian life, where appropriate, with improved attitude and motivation; and to provide subject matter expertise and guidance in support of Canadian Forces disciplinary programs and deployed prisoner of war/detainee operations.