I just watched the 1942 short film "Marines in the Making" which features training of U.S. Marines by Maj. R.E. 'Dick' Hanley. A great emphasis was placed on methods learned from the Japanese--not just jujitsu (referred to as such by name), a form of "dirty fighting", but also techniques for the stick that were also attributed to the Japanese (the ones shown had the stick held tonfa-style). One sentry take-out strangle/neck-break was said to have been recently introduced by the Japanese in "Malaya". The jujitsu techniques included arm locks, hip and other throws, and lots of chops as finishes for a downed opponent. There was also a lot of bayonet fighting, including empty-handed defenses. Interesting to see! It was a filler on TCM that I only got accidentally, at the end of what I was trying to tape.