I Saw Living Beings after a Crash

Clifford Stone...

We have attempted to shoot down UFOs in the past with little effect. We actually shot pieces off.

But during that time, there were mechanical problems with them.

The reason that you cannot go ahead and shoot a UFO down, the reason you don't have any sonic boom, you have 1/4 of an inch of a perfect vacuum all the way around the airframe.

Totally.

You cannot penetrate that backhand. No weapon known to man can penetrate it.