I read it too, and loved it, until a VN combat veteran pointed out error after error after error.
My high school American history teacher was an infantry officer in Vietnam. He assigned the book to me. Maybe different veterans had different experiences and perspectives.
This is a good read: Forsaken Warriors: The Story of an American Advisor who Fought with the South Vietnamese Rangers and Airborne, 1970-71 Kindle Edition
by Robert Tonsetic