Yes, very interesting those USO's, seems to me that there are at least a number of credible witnesses on those.
My guess is the Stanford professor Tucker is talking about is dr. Gary Nolan, who also has said a lot of interesting things on the topic in interviews, not that long ago he claimed to know a ''wistleblower'' who said that we are in ''contact'' with a non-human intelligence.
I'm not convinced about the nazi-''alien'' connection myself, the whole Operation High Jump story is a bit too weird for me to be honest.
Then again I thought the Roswell story was also, and didn't bother much with it, until I read more witness accounts, and now I am starting to think it is plausible something not of this world really crashed there.