Military bases, missile silos (which is why there are a shit ton of dots in states like Missouri and the Dakotas), airports, steel mills, chemical plants and it looks like even vehicle assembly plants.

I'm in Ohio and I can tell that one of those dots is directly on top of the huge General Motors assembly facility in Lordstown (which recently closed). I guess anything that could be repurposed to build and support war machines was considered as a potential target.