1 janv. 1960 - 1960-1975 Donald Menzel, astrophysicist, ret. USN Lt Cdr and mentor to Sagan at Harvard "was the world's leading UFO debunker... was closely tied to the intel community as a cryptologist, and had a long-standing association with NSA. A 1960 letter from Menzel to President-elect JFK mentioned his Top Secret clearance and 'some association' with the CIA. In the 1970s Menzel wrote that he 'was a consultant with Top Secret Ultra Clearance to the NSA.' Menzel and Vannevar Bush were also [WW2] friends"

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https://en.wikipedia.org/wiki/Donald_Howard_Menzel

https://nap.nationalacademies.org/read/6061/chapter/11#149

https://www.amazon.com/UFOs-National-Security-State-Chronology-ebook/dp/B0C94W38QY?dib=eyJ2IjoiMSJ9.GA0HJz5rg1XI1vhQTilun3PP3ZJPcdqJIGvqPqjftiw.Jz6jNNopiAivpCNB-tW5t5AeYDzvdvjjWfXxpdnz9a0&dib_tag=se&keywords=UFOs+and+the+National+Security+State%3A+Chronology+of+a+Coverup%2C+1941-1973&qid=1734726610&s=books&sr=1-1

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