Sarah Cato, left, Dorothy Brown, center, and John E. LaGrone, right, members of the St. Louis African American History and Genealogy Society, read a list of 173 names of former slaves who fought for the Union in the Civil War during a Memorial Day service at Jefferson Barracks National Cemetery in St. Louis on Monday, May 26, 2014. The soldiers were buried in a mass grave at the cemetery and will be honored with a plaque that identifies by name the previously unknown members of the 56th U.S. Colored Infantry. (AP Photo/Whitney Curtis)