 Regiment Groot Karoo was established in 1934 as one of the new Afrikaans language Citizen Force units of the Union Defence Force.Regiment Groot Karoo has changed its name over its operational lifespan, it was initially referred to as the Middellandse Regiment, then Regiment Gideon Scheepers and finally the regiment Groot Karoo.The Middellandse Regiment was established as an Infantry battalion with Lieutenant Colonel H.T.v.G.