AN/FLR-9 'Iron Horse' at RAF Chicksands

Former RAF Chicksands US intelligence site - the outline of the former "Elephant Cage" direction finding antenna is visible on this view.

In 1964 the San Vito base and the base at Chicksands were the first to be equipped with the FLR-9 radio interception system and were part of a new intelligence network codenamed `Iron Horse'. Three other FLR-9 antennae are known to have been built at Misawa Air Base in Japan, Clark Air Base in the Philippines, and Elmendorf Air Base in Alaska.

There was an additional AN/FLR 9 installed beside Yomitan
Air Strip above Torri Station Okinawa in 1964. Et was operate3d by members of the Naval Security Group attached to the Joint Service Processing Center at Torii.