Director David Zeiger talks about why he moved to Killeen, Texas at the age of 20 to work in a coffeehouse set up to support the anti-war activities of soldiers at nearby Fort Hood. "Sir, No Sir" documents a story that the U.S. establishment have tried to erase from history, the GI movement against the Vietnam War. The film interweaves the stories of Vietnam vets, draft dodgers and deserters with compelling footage of the day. Zeiger tells some of those stories in this interview and discusses why he decided to make the movie now, many years after the war.