The United States Naval Academy (USNA, Annapolis, or simply Navy) is a federal service academy adjacent to Annapolis, Maryland. Established on 10 October 1845, under Secretary of the Navy George Bancroft, it is the second oldest of the five U.S. service academies, and educates officers for commissioning primarily into the United States Navy and United States Marine Corps. The 338-acre campus is located on the former grounds of Fort Severn at the confluence of the Severn River and Chesapeake Bay in Anne Arundel County, 33 miles east of Washington, D.C. and 26 miles southeast of Baltimore. The entire campus (known to insiders as "the Yard") is a National Historic Landmark and home to many historic sites, buildings, and monuments.