More than 75 years after V-E Day—the German surrender on May 8, 1945, that ended the physical fighting on the Western Front in World War II—myths and misconceptions about the war remain. TIME asked the Senior Historian at the National World War II Museum, Rob Citino, which myths he has spent the most time debunking in his career as a professor of military history and author of 10 books. “Historians owe it to the millions of people who participated in this event, and unfortunately, the millions of people who died in World War II, to delve as deeply as possible into why this all happened,” he says.