In 2023, David Grusch, a United States Air Force officer and former intelligence official, was interviewed by journalists and testified in a United States House of Representatives congressional hearing. David Grusch claimed that the United States Government, in collaboration with private aerospace companies, has highly secretive special access programs involved in the recovery and reverse engineering of "non-human spacecraft" and their dead non-human pilots.

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David Grusch filed a whistleblower complaint in 2022 to Thomas Monheim, the Inspector General of the Intelligence Community, to support sharing classified information with the United States Senate Select Committee on Intelligence. He also filed a complaint alleging retaliation by his superiors over a similar complaint he made the previous year.

David Grusch claims to have viewed documents reporting a spacecraft of non-human origin had been recovered by Benito Mussolini's government in 1933 and procured by the United states in 1944 or 1945 with the assistance of the Vatican and the Five Eyes alliance. David Grusch also claims that people have been threatened and killed in order to conceal the program. The program may be called Immaculate Constellation as revealed to journalist Michael Shellenberger by another unnamed whistleblower currently in the program.