I read or heard somewhere that a lot of modern brain surgery techniques came out of Vietnam. Thanks to the basically new invention of military helicopters, they

I read or heard somewhere that a lot of modern brain surgery techniques came out of Vietnam. Thanks to the basically new invention of military helicopters, they could rapidly medivac people who previously would have just died in the field with no hope of survival. They had people out cold with dirt in their hair, etc, and they began doing things like going in through the mouth which was cleaner, had less hard structures between it and the brain than the scalp and generally healed up better. I also saw a video, probably a TED talk, by a guy who was asked by the military to revolutionize prostheses for military members who had lost an arm. He initially said that their ambitious goal for improved functionality could not be done. They inundated him with stats on people who had lost an arm serving their country. Their punchline was the number of soldiers who had lost both arms. At that point he caved and accepted this crazy sounding, "impossible" task which led to radical improvements in the tech, iirc.