A month or so ago, we all heard the stories from David Grusch, the former career American intelligence officer alleging the U.S. government is concealing a decades-long top-secret ‘crash retrieval’ program that has overseen the recovery of otherworldly flying machines and their pilots. There remains no hard evidence available to the public to substantiate these claims. Yet the U.S. military and intelligence community’s shadowy crash retrieval programs are a very real thing, although the ones we know about are focused on foreign, not alien, technology.
This is a very good overview of the Foreign Material Exploitation (FME) program. It began during WWII, had ties to Operation Paperclip, has ties to Wright Patterson (where Blue Book was located back in the day).