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.
Aylesworth Bowen Perry
The force controlled postwar unrest. Perry was a principal adviser to the government during the Winnipeg General Strike in 1919. 
After the war, he reorganized the force as the Royal Canadian Mounted Police. By modernizing the force's equipment and methods, he transformed the frontier police to a modern national police force. In 1919, he worked out the details of the force's expansion and the move of its headquarters. The Force absorbed the Dominion Police, extended police services throughout Canada and moved headquarters from Regina, Saskatchewan, to Ottawa, Ontario. The Force emerged as the Royal Canadian Mounted Police in 1920.
By February 1, 1920, the Royal Canadian Mounted Police were operating throughout Canada. Perry retired from the Royal Canadian Mounted Police in 1923. He was conferred the equivalent military rank of major-general. He died in Ottawa, Ontario, on February 14, 1956, in his 96th year. He was the last surviving member of the "Old Eighteen" from Royal Military College of Canada.