The Washington Navy Yard is the former shipyard and ordnance plant of the United States Navy in Southeast Washington, D.C. It is the oldest shore base of the U.S. Navy. The Yard currently serves as a ceremonial and administrative center for the U.S. Navy. It has the offices of the Chief of Naval Operations, the Naval Sea Systems Command, Naval Historical Center, the Department of Naval History, the Naval Criminal Investigative Service, the U.S. Navy Judge Advocate General's Corps, Naval Reactors, Marine Corps Institute, the United States Navy Band, and numerous other naval commands. Before 2006, it used to be the headquarters to the Marine Corps Historical Center, but that center moved to Quantico. The Washington Navy Yard was added to the National Register of Historic Places in 1973. It was designated a National Historic Landmark on May 11, 1976.