Digby Listening Station Royal Air Force Station England 100 Year / UK Joint Defence SIGINT Base / GCHQ / NSA Challenge Coin Army WC-135 aircraft began replacing the

WC-135 aircraft began replacing the WB-50s in December 1965 and became the workhorse of the atmospheric collection program

From 1984 to July 1991

After reporter Andreas Parsch filed a Freedom of Information Act request

This coin is approximately is 1 5/8 inches in diamter

Digby Listening Station Royal Air Force Station England 100 Year / UK Joint Defence SIGINT Base / GCHQ / NSA Challenge Coin Army WC-135 aircraft began replacing theThis coin is approximately 2 inches in diameter. Royal Air Force Digby otherwise known as RAF Digby is a Royal Air Force station located near Scopwick and 11. 6 mi (18. 7 km) south east of Lincoln, in Lincolnshire, England. The station is home to the tri service Joint Service Signals Organisation, part of the Joint Forces Intelligence Group of Joint Forces Command.[3] Other units include the RAF Aerial Erector School, No. 54 Signals Unit and No. 591