The origin is US Officer training. Presumably West Point. The lecturer is a brilliant historian who I am not familiar with. It's a little clinical, but if you pay attention to the details, some of the content is jaw-dropping.
http://youtu.be/7Clz27nghIg
Here is a link to the transcript upon which it is based.
http://sti.clemson.edu/publications...-1941-1945-myths-and-realities-a-survey-essay
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