Good question. They definitely do have launch control centers. All available information online does seem to indicate that is the case that the silos themselves are unmanned. My understanding is that there was some security on site, but that is just based on second hand stories I've heard, and may not be true.
I do see military vehicles traveling to and from the one that I am close to semi regularly, perhaps a month or so on average.
As far as fire response, they likely have their equipment for that at the control centers as well.
