speaking of creating tough and survival or fighting mentality. This is a method the army uses.
Taking a lot of falls takes some tough. And that looks like a lot of fun, too. I love it when "fun" and "tough" come together.
(A side story: A shodan I trained with brought some of our art to the Marines (the DT instructor requested it after he handed a couple of larger Marines their *** in training). He'd have loved it if there was some BJJ there at the time, too.)