TOPIC: Looking for the names of some Cape Policemen if you can help please?

Hello

Anyone know where I might find the first names of a batch of the Cape Police, who had the Cape of Good Hope General Service Medal, please?

It's for:
Ackerman JJ
Els CW
Els JM (there are two of them)
Ferreira IP
Jacobs WD
Marais WJ
Oosthuizen J
Proctor W
Smith CM
Swart HJ

I am doing a bit of a research project, details to be posted later, and I need to work out if these men are the men I am interested in or not, but I can only match them with some more information.

Thanks for the help!
Ryan