Ok, now I‘m interested in the topic.
According to Canada‘s Militia: A Heritage at Risk by T.C. Willett, in 1990 Mobile Command Consisted of the Regular Army (1 CBG, 5 GBC, and the SSF). The Militia consisted of:
HQ Pacific Area (Vancouver): 2 Militia District HQs
HQ Prairie Area (Winnipeg): 4 Militia District HQs. I think I was mistaken about Lakehead. It wasn‘t part of Prairie Militia Area but was amalgamated with Manitoba District after LFWA and LFCA stood up.
HQ Central Area (Toronto): 6 Militia HQs
HQ Secteur L‘est (Montreal): 3 Militia District HQs
HQ Atlantic Area: 6 Militia District HQs
LFCA stood up in 1990, LFWA in 1991 and SQFT/LFAA in 1992.
38 CBG HQ website provides some further details:
The first western Military District was formed in 1870, with the formation of Manitoba as a province to the confederation of Canada. Saskatchewan formed its own Military District in 1905.
In December 1941, brigades across the country were organized and commenced training for the defence of Canada. In February 1942, brigades were formed for each of the 11 military Districts of the militia. Regionally, Manitoba formed the 38th (reserve) Brigade Group and Saskatchewan formed the 40th (reserve) Brigade Group. Their mission was to train soldiers towards domestic security and to continually support the war effort with the recruitment of young men and women.
In 1948, Prairie Command was formed. It was comprised of Saskatchewan, Manitoba and Northwestern Ontario, and was headquartered in Winnipeg. In 1959, Prairie Command Headquarters closed and Northwestern Ontario reverted to Central Command, while Saskatchewan and Manitoba came under control of Western Command.
So, it appears that we have military districts until 1948. Prairie Command was formed from 1948 until 1959 (I have to assume that BC and Alberta belonged to their own Commands?). Western Command was in existence from 1959 until Mobile Command in 1967(?). This structure remained the same until the early 90s?
Anyone else want to take a stab at it?