My mother told me of an experience she had with one. My grandad was in the air force and posted to a small radar station up north. This was cold war days. Anyways one night they were outside playing in the yard and noticed a craft of some sort. Disc shaped. She said it hovered maybe 150 feet up. Silent. A few lights on it. I guess my uncle was so scared he hauled a$$ and hid under his bed.
Next day some big wigs showed up and asked what was seen. They told them what they saw and then the men told them they didn’t see anything and it was best to keep quiet about it. I’m not saying it was a UFO, but I bet we have aircraft that are years beyond what the public sees. Even your run of the mill military pilots