Norfolk was a place in Virginia.
Vida Swann told the Tenth Doctor that a Vice Admiral was coming from Norfolk. He presumed that she meant Norfolk, but she clarified Norfolk, Virginia. It was the location of the largest naval base in the world and was the main port on the Eastern Seabord. (PROSE: The Feast of the Drowned [+]Stephen Cole, BBC New Series Adventures (BBC Books, 2006).)