The United States National Vigilance Park (NVP) is a memorial to the military servicemen who participated in aerial reconnaissance during the Cold War. Dedicated on September 2, 1997, NVP is located just one block from the National Security Agency (NSA) headquarters at Fort George G. Meade, Maryland. It is open 24 hours a day for viewing. Military events connected with the Intelligence Community and/or personnel stationed at Ft.