I have an alternative view of this well-documented phenomenon: UFOs disabling U.S. nuclear missile silos.

https://www.prnewswire.com/news-releases/former-usaf-officers-to-present-evidence-of-ufos-tampering-with-nuclear-weapons-301395385.html

I propose this was the U.S. military demonstrating an above-top-secret method to neutralize nuclear weapons. If we can shut down our own nukes, that means we’d be able to shut down Soviet nukes.

So, on the hypothesis that we already had advanced field-propulsion vehicles by the 1960s and that we’ve actually had this capability since the early post-war period, by the 1960s this super-secret weapon was outfitted with electromagnetic pulse technology to bombard the hardened electronics in nuclear missile systems. This would have temporarily taken down these systems.

But, hey, I’m not telling you anything you don’t already know. It’s all in Flying Saucers!