Originally known as the Botha Group which had formed part of the Northern Command since around 1953 (which became the Northern Transvaal Command in 1959), the Group 12 Headquarters [Afr: Hoofkwartier, Kommandogroep 12] was established in 1969 with its base at Ermelo, originally under the Northern Transvaal Command in Voortrekkerhoogte. Upon the formation of the Eastern Transvaal Command in Nelspruit in 1983 the Group 12 HQ was placed under the command of the newly formed command. After the closure of the Eastern Transvaal Command in 1997 the Group HQ was also closed down This occurred after President Mbeki announced the disbanding of the commando system on 14th February 2003.

Originally known as the Botha Group which had formed part of the Northern Command since around 1953 (which became the Northern Transvaal Command in 1959), the Group 12 Headquarters [Afr: Hoofkwartier, Kommandogroep 12] was established in 1969 with its base at Ermelo, originally under the Northern Transvaal Command in Voortrekkerhoogte. Upon the formation of the Eastern Transvaal Command in Nelspruit in 1983 the Group 12 HQ was placed under the command of the newly formed command. After the closure of the Eastern Transvaal Command in 1997 the Group HQ was also closed down This occurred after President Mbeki announced the disbanding of the commando system on 14th February 2003.