From the National Park Service:
MASNASSAS, Va. – In cooperation with U.S. Citizenship and Immigration Services, Manassas National Battlefield Park will host a naturalization ceremony on Thursday, July 21, 2016, in recognition of the Centennial of the National Park Service. The ceremony will coincide with the 155th anniversary of the First Battle of Manassas, the first major battle of the American Civil War, fought on July 21, 1861.