Active Militia or NPAM. Regiments and other units of the Militia were not mobilized, but rather transferred personnel to the CEF for overseas employment. The CEF was disbanded after the war. Major battles and campaigns involving the Canadian Expeditionary Force Interwar period modernization The Otter Committee reorganized the Canadian Militia in 1920, instituting a series of perpetuations so that both the pre-war Militia and the CEF had their traditions and histories integrated into the modern Canadian forces. The numbered pre-war regiments were all reorganized and redesignated; the archaic system of numbered regiments in the cavalry and infantry was dropped, with several exceptions such as 1st Hussars, the Royal 22e Régiment (originally the 22nd (Canadien-Français) Battalion, CEF), and the 48th Highlanders of Canada (48th Battalion (Highlanders)). In 1936, the Non-Permanent Active Militia had six tank battalions created as part of the infantry, the first step towards modernization. Canada's land forces underwent two major organizational changes between the world wars; in 1920 the pre-war regiments were all renamed, several organizational corps were created mirroring corps in the British Army, and new ones like the Canadian Machine Gun Corps or CMGC (not to be confused with the wartime corps of the same name) were created. The new regiments all perpetuated the history of the wartime CEF, and when battle honours were granted many years later, were permitted to adopt those battle honours. In 1936, the CMGC was abolished and the Militia again underwent dramatic reorganizations, with three types of infantry regiments being created (rifle, machine gun, and tank). Many regiments were disbanded or amalgamated. Second World War The Second World War saw major changes to the Canadian Militia. Acting on the suggestion of General Harry Crerar, the Militia were renamed as the Canadian Army through an Order in Council on 19 November 1940. PAM was reorganized as Canadian Army (Active), whereas NPAM became Canadian Army (Reserve). Many infantry regiments were transferred to the Canadian Armoured Corps, created the same year. Cavalry regiments were mechanized, the horse was withdrawn from military use, and the Royal Canadian Army Veterinary Corps was disbanded. In 1939, the Canadian Active Service Force (CASF) was mobilized; similar to the CEF, this was a mobilization of prewar PF and NPAM units, who retained their traditional titles. In 1940, the land forces of Canada were retitled. The CASF became the Canadian Army (Overseas), the Permanent Force became the Canadian Army (Active)