My guess is that it’s an open secret kind of thing. There’s not a big sign that says “nukes here!” but when you see stuff like the previous poster mentioned, you can guess what’s going on.
It was easy to get confused in a lot of dirt roads out in Nebraska, but just ask any local rancher, "Hey, where's Sierra Seven?" They'd tell you. All the locals knew all about it, the original quarter acre plots were bought from local ranchers. And, of course, every several years, a big missile on a lowboy would come down the road, with a convoy.