There was an amazing event in 1962 at Loring AFB in Maine.
A huge craft (larger than a football field) hovered over the main air-strip with dozens of witnesses.
The people from the tower watched in shock as the airmen on the field were “turned into zombies” for several minutes.
The source for this information is this book:
https://www.amazon.com/Confession-Hidden-Alien-Encounters-Revealed/dp/1695688856
One of the authors also wrote this book that lists dozens of incidents at nuclear sites:
https://www.amazon.com/UFOs-Nukes-Extraordinary-Encounters-Nuclear/dp/1544822197
We are talking many witnesses, all kinds of radar, jets scrambled to intercept the craft etc etc etc. for decades over dozens of these sites.
Why doesn’t this stuff ever happen post-1975?