It is a movie. It was a very early R. Lee Ermy appearance. It is closest to my recollections of reality.
The documentry was based on a Time magazine story about "Charley Company" and a reunion.
Thanks for the info. I just did some online research and learned that the documentary I remembered was called "The World of Charlie Company."
It was a remarkable piece at the time because one part of it included what was basically a mutiny by Charlie Company against their commanding officer.