AFAIK, only test silos and stuff left over from previous ICBM progams. Never was an operational ICBM base, but an AF dweeb woulld know for sure. Sure was not the couple times I visited there on business, security was no big deal.
Of course, having a few working Minuteman silos, who knows how much it would take to turn it into a functioning base? The support is all there, complete (I would guess) with all the trimmings for launch crew to practice same-same as with a real launch.