I've personally seen (with a group of about ~20 others) a TR-3B in 1988 at Truckee Airport in Lake Tahoe Ca.
It rose on the horizon over the mountains, way off in the distance.
Then within about 2 seconds it was hovering directly above us about 100 feet up.
It was huge, silent.
I was marching in my Civil Air Patrol group. Our commander was a former SR-71 mechanic when it was still a top secret program.
He was doing the marchine exercise and when we saw the craft we all watched it - then when it basically teleported directly above us - he very quickly ushered us back into our group hangar.
I've seen others - but this was the closest I have been to one.
It has shaped my reality ever since (I was 14 when it happened, and I am 48 now)