Knew a guy that did radar duty back in the day. I believe he was somewhere in Maine.
He related experiences where they observed high altitude “fastwalkers” that would make incredible high speed maneuvers and leave the airspace as soon as anybody was scrambled to take a look. Sometimes they’d return as soon as the plane was back on the ground.
He was a believer. Use as many grains of salt as you’d like.
FWIW, I was a computer maintenance man on the NORAD SAGE system and was on duty the night this happened (this incident was later declassified and featured on the show "Unsolved Mysteries.") I witnessed (from the Air Defense scopes) these "unknowns" making all kinds of increadible maneuvers.
Just for fun - the maintenance console of the SAGE computer system (IBM Q-7)
