21 South African Infantry Battalion

21 South African Infantry Battalion is an internal stability unit of the South African Army.

History
21 SAI was established on 1 January 1991 at Doornkop, Johannesburg. In 1997 the unit was commanded by colonel and consisted of two operational battalions. By 1999, it had reverted to four infantry companies and a reconnaissance platoon.

The unit has its origin as 21 Battalion created in 22 January 1977 to train black soldiers. The unit trained black recruits that formed units from the black homelands of Transkei, Venda and KwaNdebela as well men from Ovamboland. By 1986 it had four companies of its own troops and in July 1987 became a fully operational battalion and used as a reaction force in South Africa before being posted to South-West Africa/Namibia in 1988 during the Border War.