But isn't it the case that there is typically no personnel at the silo (or Launch Facility LF) itself? Instead, the Missile wing Commanders at the Launch Control Centers (LCC) some distance away. The LCC commands some number of LFs remotely.
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.