Some of the footage shown at the "Proving Grounds" announced in Springfield, IL, was actually in Mechanicsburg, which is just east of Springfield. The "Mechanicsburg Blacktop" was the quasi drag strip in those days between the two cities/towns as always maintained well. Before I had a driver's license we used to hitchhike out there when skipping school to watch them abuse equipment, (oh, I meant "test") or use it harder than it would ever theoretically endure in service.
Many of my high school friends relations put that equipment together, or worked there, so was always easy "free reign" to watch, (or ride along).