19 May 1998
Thaba Tshwane is the military headquarters of the South African National Defence Force (SANDF) in Pretoria. The base had been known as   Voortrekkerhoogte since 1939. , It was officially renamed on 19 May 1998, marking its third name change. The military base was founded in 1905 by the British Army and was named Robert Heights after Lord Roberts, a British soldier and one of the best commanders of the 19th century.
References

South African Government Information ADDRESS BY THE MINISTER OF DEFENCE, THE Hon. MR JOE MODISE, ON THE HISTORIC OCCASION OF THE NAMING OF THE THABA TSHWANE MILITARY AREA, PRETORIA, 19TH MAY 1998 [online] Available at:>https://www.info.gov.za[Accessed on 14 May 2013]|

Wallis, F. (2000). Nuusdagboek: feite en fratse oor 1000 jaar. Kaapstad: Human & Rousseau.