49. Edzell, Angus. (NO 631 687)

Edzell was one of the most important intelligence centres in Scotland, particularly between 1960 and 1997 when it operated as a US Naval Security Group Activity, a branch of the National Security Agency (NSA). Edzell performed a variety of functions for the US Navy, including the Naval Ocean Surveillance Satellite system, also known as White Cloud. It's main role however, was to monitor and track Soviet submarines in the North Sea. It was closed because as technology improved, it was no longer necessary to operate a base in Scotland like Edzell, as the functions could be performed from the United States. Some of Edzell's operations were also transferred to Menwith Hill in Yorkshire.

After the closure of the base, the domestic land, including the accommodation blocks were put up for commercial sale. However, a few buildings on the airfield have not been demolished and may become operational again in the future. A photograph of Edzell is available at www.subbrit.org.uk/rsg/sites/e/edzell/.