I think it would be more sensible to employ a good firm to provide security guards. Make sure that they pay well, don't skimp. You don't want your security getting too chummy with the staff. Better that they rotate round a few sites. You want professional detachment - rules applied equally to the lowest and the highest grade staff. Plus, being a guard could be very boring, and getting a chance to work different sites with different challenges could bring job satisfaction.

I like the idea of someone going in to the space industry and ending up as the orbital debris specialist. It's kind of what happened to my career!