Back in the middle to late '60s, I once had a couple of B-52s pass directly overhead at what seemed like brushing the tree tops altitude. I was deep in the mountains of S.E. Oklahoma at the time. It was totally mind blowing - seemed like the world was coming to an end when I first heard them in the distance right before they roared overhead. I suspect they came from I.V's base in Louisiana, but much too early for him to have been there.
The only way of discovering the limits of the possible is to venture a little way past them into the impossible - Arthur C. Clarke