First episode:
Déjà Vu (1858-1961) | The Vietnam War | Explicit Language Version | PBS
Years ago on recommendation from Danimal16, I read H.R. McMaster's (current National Security Advisor) Dereliction of Duty which was an excellent, powerful retelling of how we got involved in Vietnam. And the seed of our friendship so it's a great book.
Just finished the first episode, definitely something worth watching. Going to reread the book again along with the documentary.