The Comptroller of the Currency charters, regulates and supervises banks throughout the United States. The office also supervises the federal branches and agencies of foreign banks. The Comptroller has four district offices, as well as an office in London to supervise the international activities of national banks. The office was established in 1863 as a bureau of the U.S. Department of the Treasury. The Comptroller serves as a director of the Federal Deposit Insurance Corporation (FDIC) and a director of the Neighborhood Reinvestment Corporation. The office has a nationwide staff of examiners that conducts on-site reviews of national banks and provides sustained supervision of bank operations. The agency issues rules, legal interpretations and corporate decisions concerning banking, bank investments and bank development activities. The Comptroller of the Currency maintains its headquarters in Washington, D.C.