The firing center has very few soldiers that reside there. It is mostly a training ground for JBLM over by Tacoma. The Kittitas valley is irrigated farmland mixed with small acreage homesites. There is a sizable population of commuters that work in the Puget Sound area that live here. Ellensburg has a medium to large regional university. We have forested mountains on more than 2 sides and plenty of
shrub-steppe to the east and south.
The North Puget Sound region is green and has lots of rural roads with good access to the mountains and sound. I've no personal knowledge of the traffic volumes and have not cycled any of it. I've driven semi on some of it.