The D.C. Armory is an armory and a 10,000-seat multi-purpose arena in the eastern United States, located in Washington, D.C., east of the U.S. Capitol building. Managed by the Washington Convention and Sports Authority, the Armory was constructed and opened in 1941, as the headquarters, armory, and training facility for the District of Columbi…The D.C. Armory is an armory and a 10,000-seat multi-purpose arena in the eastern United States, located in Washington, D.C., east of the U.S. Capitol building. Managed by the Washington Convention and Sports Authority, the Armory was constructed and opened in 1941, as the headquarters, armory, and training facility for the District of Columbia National Guard. In recent years it has also become a venue for a broad range of events. Adjacent to the northeast is RFK Stadium, which opened in 1961.