Pentagon's shameful effort to draft mentally disabled men to fight in Vietnam

A stellar 30 minute talk by the author of MacNamara's Folly: https://youtu.be/_J2VwFDV4-g?si=iLn6JKWbKjCrcgsj

I am disappointed by the lack of citations in this article. I am assuming much of this information is from the mentioned book, McNamara's Folly.