Indianafag here, old man used to work as maintenance at Grissom when I was a kid, this is normal, when I was a child, I can remember A10s flying overhead almost daily, usually training runs between Ft. Wayne (There's an Air National Guard base, plus Ft. Wayne International) and Grissom. I have always been told, but cannot confirm, the A10s will "target" grain bins and other large structures as if they were enemy targets.