Keith Snyder, an Antietam National Battlefield park ranger, and a native of Martinsburg, W.Va., discusses the historical significance of the Battle of Antietam with Fort Meade chiefs and their FY15 chief selectees Aug. 30, 2014. The Fort Meade chiefs conducted a heritage visit to Antietam National Battlefield and took a guided tour of the battlegrounds. The Battle of Antietam took place Sept. 17, 1862, and is often referred to as “the bloodiest single-day battle in American history.” More than 23,000 soldiers were killed, wounded, or left missing in the wake of this 12-hour battle. (U.S. Navy photo by Senior Chief Mass Communication Specialist Daniel Sanford/Released)