Visitors to Washington, D.C., pass many memorials during their trips, including those dedicated to wars throughout the nation’s history. The black granite of the Vietnam War Memorial. The fountains and columns of the World War II Memorial. The 19 stainless steel statues of the Korean War Veterans Memorial. One war—dubbed “The Great War”—has been the only one missing. That changes April 16, 2021, with the First Colors ceremony unveiling the National WWI Memorial.