[1] Before the end of the Second World War, small signal sections provided tactical communications for the Canadian Army's various brigade headquarters.

In 1958, as part of the reorganization of the Canadian Army, 1 Signal Squadron was formed from elements of the 1 Canadian Divisional Signal Regiment, in Borden, Ontario and was relocated Calgary, Alberta by the end of the year.

[2] Initially, 1 Signal Squadron was a separate unit from the brigade group headquarters.

In 1972, for reasons of efficiency and cost effectiveness, 1 Combat Group Headquarters and 1 Signal Squadron were combined into 1 Combat Group Headquarters and Signal Squadron.

[3] In 1978, the unit was redesignated 1 Canadian Brigade Group Headquarters and Signal Squadron, and took its current name in 1992, becoming the 1 Canadian Mechanized Brigade Group Headquarters and Signal Squadron.