I believe that Mr. Smith writes a good bit about his history in Martial Musings.
Never read that. Maybe I've seen excerpts. Is he also the one who wrote as "Gilbey," all these ridiculous farcical adventures in martial arts?
As for the film clips of the MPs, I've only seen bits of that and most of what I'm familiar with came from people's writing about the event and about the film clips. And as to that, Mifune taught judo for the Air Force after the war, so he could probably have done a similar thing with the MPs. I just know it's way beyond what anyone I currently know could do. Except maybe Dan Harden or Mike Sigman. Or someone who is like 6'5" or something....