Filmmakers Ken Burns and Lynn Novick believe now is the time to turn back to the Vietnam War. They say to understand war, we need the passage of time. Their forthcoming 10-episode series called The Vietnam War , launches Sunday, September 17 at 8 p.m. on WXXI-TV. It's an immersive narrative featuring archival footage, photographs, and conversations with nearly 100 witnesses, both in American and Vietnam. You can watch a 30-minute preview here . Lynn Novick is the co-director and producer of the