Vallee’s book is about a UFO that landed adjacent to the Trinity nuclear test site in 1945—the UFO landing and retrieval by .gov is the Trinity “incident”.
https://www.amazon.com/Trinity-Best-Kept-Secret-Jacques-Vall%C3%A9e/dp/166711364X
It is the first known “crash retrieval” that is the subject of the Wilson/Davis memo and hopefully will be the subject of Congressional investigation later this year.
For a deep dive on this subject here is an excellent discussion—the pdf file is over 300 pages:
https://omega-point.medium.com/loose-threads-af8f652ee8cb
I think some of the people involved in the ‘Trinity’ story were actually harmed by the bomb test - I think it was one of the boys and one of their mothers (?)
Thanks