Dear Farsight, I think this would be a good target because it had a lot of credible witnesses, Brazilian and USAF military involvement in the transfer of two captured ET to the US, the death of a soldier who captured one ET, and government coverup.
As background I suggest watching James Fox documentary Moment of Contact - New Revelations of Alien Encounters (2025). I would like to know especially what happened to the captured ETs, their origin, and their welfare status.

The CIA denied a 2022 FOIA request for Brazil to US flights when the live ETs were transferred. The Brazilian soldier who caught one ET died shortly after due to a super resistant bacteria the hospital had never seen before or since, apparently from a scratch.