F.E. Warren AFB is a missile base, that's all they really support. You have Security Forces who support the main base, then you have cops that support the missile fields, and QRF that support the movements of missiles and other special items that go between main base and the missile fields. You have folks like me who work(ed) in the Missile fields supporting the missile combat crews and security forces who stay out there for days at a time. The main base is really quiet due to the mission being out in NE and CO. And by quiet, I mean it's not really a busy place?. But it is a sprawling base with lots of open areas, and old historic buildings and grounds.
If he likes hunting, then he'll be right at home. To the west you have the Medicine Bow and Snowy Ranges that hold tons of Elk, Deer, Moose, and Antelope. F.E. Warren AFB is a Antelope sanctuary of sorts. I believe they still keep the base herd healthy and strong to support other states herds with transplants. They do have an archery only season on base with a limited quota.
The town of Cheyenne is a decent size, but small enough that it too gets quiet at night. If he is young and likes the night life, then he'll probably hit of Fort Collins CO about 30 miles south. It has everything you'd need as a young Airman...Bars, restaurants, college girls.
I retired out of F.E.W. back in 2011, and instead of moving back home, I stayed in place. Got a job in the Oilfield, got out before the bust, and now drive fuel tankers making really good money. But sometimes the road conditions and weather make me think of moving every year LOL. But I've stuck it out for 12 years now, and will probably stick around.