I mean, look at Colorado.
USAFA could be old training grounds

Norad could be where they monitored the Nukes and you had the chance to blow up the rest of the world.

Fort Carson could be where the artillery is stored.

It could also contain three cities along I-95.
Pueblo: The cowboy-west farmlands

Colorado Springs:A suburban city with a 14'r mountain in which you can climb

Denver:The Mile high city (although the springs in higher)

With Colorado having many military outposts, why not nuke it?