Arlington County, Virginia Court, is the only other President buried at Arlington. Other frequently visited sites near the cemetery are the U.S. Marine Corps War Memorial, commonly known as the "Iwo Jima Memorial", the U.S. Air Force Memorial, the Women in Military Service for America Memorial, the Netherlands Carillon and the U.S. Army's Fort Myer. The Pentagon in Arlington is the headquarters of the United States Department of Defense. It was dedicated on January 15, 1943 and it is the world's largest office building. Although it is located in Arlington, the United States Postal Service requires that "Washington, D.C." be used as the
Arlington County, Virginia county having the same name, a movement started to rename Alexandria County. In 1920, the name Arlington County was adopted, after Arlington House, the home of the American Civil War Confederate general Robert E. Lee, which stands on the grounds of what is now Arlington National Cemetery. The Town of Potomac was incorporated as a town in Alexandria County in 1908. The town was annexed by the independent city of Alexandria in 1930. In 1896, an electric trolley line was built from Washington through Ballston, which led to growth in the county (see Northern Virginia trolleys). In 1920, the Virginia