Possibly in the past. There are many topics about black projects, tech and such, but it can't be verified, although it might be true it's just a story since we are only hearing alleged realities that no one is privy to demonstrate as a real reality.
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Astrophysicist, Dr J.Allen Hynick, referred to it as an “embarrassment of riches”, when looking at all the vast amounts of data we have to corroborate that we are not alone in the universe or even in our own very solar system! This relates to UFO's (man made reverse engineered), actually ET and also relates to the AI threat.
Here is an article I wrote if curious... peace
https://steemit.com/deepdives/@dill3166/top-ufo-incidents-and-sightings-proving-that-we-are-not-alone