Jan Smuts Security Unit, Sharpeville & Lt. Col. G.D. Pienaar (1904-1963)

Gideon Daniel Pienaar, 1904-1963 was a personal aide/bodyguard to Jan Smuts (based on family photographs I assume it was nearer the end of Jan Smuts' life, so before 1950).

While there is a lot of press in newspaper archives regarding his role as Station Commander/Lt. Col. at the Sharpeville Police Station, as well as interview material in various inquiries/TRC archives online regarding his role in this incident, I'm unable to find any reference to his role in the personal protection of Jan Smuts (although I do have a photo or two which may have some clues).

How might I go about finding evidence of this? Are the SANDF or SA Military Archives which would show who worked alongside him in a guard-like capacity? Perhaps photograph archives showing him with his security team?