Pretty unusual to see a V-22 Osprey flying through Louisville with no Air Force or Marine bases (the primary users of the plane I believe) nearby. I assume it was just passing through. I'm not sure if the Army ever uses the plane or not. It may have been doing some kind of exercises at Fort Knox. Wish I heard it sooner to get a picture of it. I was in the Air Force and worked around aircraft so I find things like this interesting.