In about June of 1965, while in the U.S. Navy, aboard a destroyer in the Western Pacific, we observed a UFO on radar at about midnight one night. We first picked up the object on our long range air search radar at about 300 miles. It flew down our radar beam, descended towards our ship, overflew us and then exited on a reverse profile, disappearing at about 300 miles again. This happened in an extremely short period of time.
In the ensuing 40 years, I've forgotten the particulars, but I do remember that we calculated the craft's speed in excess of 50,000 mph. This was not a so called ghost image, or a radar signal bouncing off the moon.
We were a seasoned crew of trained radar experts. We knew what we were seeing and tracking.