31 Canadian Brigade Group (31CBG; French: 31e Groupe-brigade du Canada) is part of the 4th Canadian Division, under the Canadian Army. It encompasses the southwestern portion of Ontario, and is headquartered in London, Ontario. The 31 CBG area of responsibility stretches from Hamilton to Windsor. The brigade has approximately 2000 soldiers. Colonel Brock Millman, CD is Commander of 31 Canadian Brigade Group. The brigade sergeant-major is Chief Warrant Officer Dave Ellyatt, CD.
31st (Reserve) Brigade Group was created, within 1 Militia District, on 1 April 1942 when the reserve force in Canada was reorganized for the war. Like today, the formation consistend of part-time soldiers who paraded and trained on evenings and weekends. The brigade group was closed down on 28 November 1945 and the headquarters itself closed on 8 June 1946. During its existence, the brigade group was headquartered in London Ontario and it held the following organization:
Canadian Infantry Corps
1st (Reserve) Battalion, The Middlesex and Huron Regiment
2nd (Reserve) Battalion, Canadian Fusiliers (City of London Regiment) MG
2nd (Reserve) Battalion, The Essex Scottish Regiment
2nd (Reserve) Battalion, The Scots Fusiliers of Canada
31 Canadian Brigade Group (CBG) was recreated on 1 April 1997, with its headquarters located in London, replacing the London Militia District (LMD). Resulting from a major restructuring of the army, it was established as one of ten reserve brigade groups organized across Canada.