On 16 February 1941, the 14th Army Tank Battalion (Calgary Regiment) was mobilized at Mewata Barracks. When the Canadian Armoured Corps was created, the Calgary Regiment lost its status as an infantry regiment and transferred to the new corps. A reserve regiment remained in Calgary. The regiment was composed of 400 members of the reserve battalion, drawing also from reinforcement personnel from The Seaforth Highlanders of Canada and the Edmonton Regiment. The original 'A' Squadron was drawn from Olds and district, 'B' Squadron from Stettler area, 'C' Squadron from Red Deer, and Headquarters from Calgary, High River, and Okotoks district.