Butler was home to the American Bantam car Company which produced the original Jeep. Willys & Ford eventually took over production for a variety of reasons.
There's a page on Wikipedia dedicated to the company. Just search American Austin car Company. They have a Bantam Jeep festival every year there as well. Pretty big deal.
Funny, I was just past the The Andy warhol Museum here in Pittsburgh today and they have a WWII display going on. They have the oldest known bantam Jeep on display there. I am going to try to get to see it and post up some photos.