Stahl, Joseph: - Matthew Borders has an MS in historic preservation. He is a park ranger at Monocacy National Battlefield and is a member of the Save Historic Antietam Foundation and the Frederick County Civil War Round Table. Joseph W. Stahl has an MBA; is retired from the Institute for Defense Analyses; is a member of the Company of Military Historians, Save Historic Antietam Foundation and Hagerstown Civil War Roundtable; and is coauthor of Identification Discs of Union Soldiers in the Civil War. Both authors are NPS Certified Battlefield Guides at Antietam National Battlefield and Harpers Ferry National Historical Park.