During the Viet Nam War the USAF ran a 3 day survival course outside of Clark AFB, PI. The course was targeted at air crews on their way to VN and was intended to give them a brief introduction to surviving in the wilds in case they were shot down. Typically, USAF pilots, Forward Air Controllers and Army helicopter crews were allowed to attend. If one were stuck over at Clark for a few days and was an EM and couldn't get off base, well, it was something to do. The USAF hired Filipino instructors and part of the 3 days included self defense training with a survival knife. One of the instructors was well respected, having learned his trade as a young man fighting against the Japanese. I gather he had over 50 kills. Anyway, does the US military have any training of this nature these days?