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Basically, a UFO. UAP stands for Unidentified Anomalous Phenomena. Previously referred to as Unidentified Aerial Phenomena, aerial was changed to anomalous in December 2022 to account for the many trans-medium objects that have been observed, according to the DoD.
David Grush is a USAF officer and former U.S. Intelligence officer turned whistleblower. In July of 2023 he made history in his interview with Ross Coulthart, in which he claimed through years of gathering evidence from first hand witnesses that: the U.S. government has had a multi-decade reverse engineering program, is in possession of biologics from these recovered craft, and have committed serious crimes in hiding these programs from public knowledge. You can watch this documentary to get a more personalized viewpoint on why he decided to come forward.
Non-human intelligence.
Able to travel between air, water, and space.