He admits he got convinced after reading Corso's book. Nobody believes Corso's book, not even ufologists like Stanton Friedman.

Being defense minister is irrelevant. This is an appeal to authority. If a defense minister says it, it must be true. Not so. He needs to provide proof like everyone else. He was never privy to secret documents while executing that function. He has no concrete proof of anything. Of course, because he was defense minister, he was immediately recruited to the ufo congress circus and paraded about.

Another? What "others" do you consider as a confirmation of UFO reality? (meaning not unidentified flying objects, but as I assume you mean, extraterrestrial spaceships)?