Ryan, Grush also mentioned that during his time as an intelligence officer, that he learned that the U.S. had a UFO crash retrieval program, but also that our adversaries had these same crash retrieval programs, most notably Russia and China.
There's a lot of documentation from the Soviet Union and Russia and interest shown in China on these topics as well.
Never mind the fact that our adversaries often, such as China, have the ability to put a large amount of resources and people into specific problems,