The Harvey Point Defense Testing Activity facility, owned by the Department of Defense, is located on a peninsula in Perquimans County, North Carolina, along the Albemarle Sound, near the city of Hertford, NC.
Government - National - USA, Covert
Established in World War II as an operating base for sea planes conducting anti-submarine surveillance of the Atlantic coast, it is currently used by the CIA's National Clandestine Service for personnel training in explosives, paramilitary combat, and other clandestine warfare techniques.
A close-by Naval facility in Weeksville, NC served as a blimp base during and after WWII.
Links: en.wikipedia.org, cryptome.org