I was a design engineer at Republic Aviation the year Colliers Magazine had a great series on space platforms.
I was called from lunch outside where a round, bright silvery object was directly overhead.
I moved so it could be seen lined up with the edge of the factory roof, I wanted to see if it moved like a balloon.
It did not move for over 10 minutes.
I had to check a problem on an F84F located about a ½ mile away, drove there, entered cockpit & looked up.
The object was still there.
When I looked up a few moments later the object was gone.
One of my friends at the plant said it streaked northeast over the horizon in a few seconds.
He calculated various speeds at different altitudes, all fantastic.
I was an Air Force B24 pilot a few years before & never before or since have seen what I would call a UFO.