They slapped a cover page saying "no evidence" on the front of Project BLUE BOOK report in 1955, but the data they found is quite compelling.

From the Cover page of the archive:
About Project Blue Book
Project Blue Book was the code name of the U.S. Air Force’s UFO investigation. Strictly speaking,
this name applies only to the time period beginning in March 1952 and ending with the close of
investigations in January 1970. Less formally, the name is used to connote the Air Force’s entire
period of investigations, which began inside the Air Materiel Command at Wright-Patterson AFB
without a specific code name on June 30, 1947. The first named investigation was Project Sign,
which was formally initiated on January 26, 1948. This name was changed to Project Grudge on
February 12, 1949, and again to Project Blue Book on March 25, 1952. Though it may appear to
be a continuous operation, these UFO investigations were subject to shifts in the Air Force
priorities and by internal Air Force politics.

Download the Blue Book report here:
https://drive.google.com/file/d/1iXMMUjFcc1UMfI3L_j3QM9w_VjmMIfeb/view?usp=sharing

Will we see the same method by the USAF again to underplay the evidence for extraterrestrial life?

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00:00 Intro
03:00 Project BLUE BOOK
11:54 Evaluation of Individual Reports.
17:30 How valid is the data ?
22:25 The 12 good 'unknown sightings' reports