LFWA was created on 1 September 1991, taking command of what was previously Prairie Militia Area, Pacific Militia Area, and the Regular Force Army units and formations in western Canada from the northern lakehead region of Ontario to the Pacific Ocean. At that point in time, the Militia Areas ceased to exist, and the seven subordinate Militia Districts were reorganised into four: British Columbia District, Alberta District, Saskatchewan District, and Manitoba-Lakehead District.
