Ken Burns and Lynn Novick’s The Vietnam War released in 2017, after being in production for almost a decade. The result was one of the most comprehensive and exhausting pieces of war films ever made. Interviewing veterans from both sides of the war, and consciously staying away from historians and academics—the ten-part series (with a cumulative runtime of nearly 18 hours) mimics the long, arduous nature of the war fought by the Americans actively for nearly two decades. The series—made on a budget of around $30 million—played on the Public Broadcasting System (PBS) in America. Seven years after The Vietnam War came out and was hailed for its thoroughness, Lynn Novick reflects on the documentary. In an interview with Tatsam Mukherjee, she also touches upon the recognisable patterns that emerged from Vietnam, which were repeated in the USA’s entanglements in Iraq, Afghanistan; the fraught nature of truth these days and the responsibility on documentary filmmakers and journalists; and the burden on war documentaries to be cautionary tales for us. The hour-long conversation has been edited for clarity. Excerpts: