US ARMY FIELD STATION CHITOSE

US Army Field Station Chitose was a United States Army Signals Intelligence (SIGINT) installation located near Chitose, Hokkaido, Japan. Established in the early 1950s during the Korean War, the station played a pivotal role in monitoring Soviet and Chinese military communications throughout the Cold War. Operated primarily by personnel from the Army Security Agency (ASA), it contributed significantly to US and allied intelligence efforts in Northeast Asia. The station was eventually closed in 1973 as part of a broader realignment of US military assets in Japan.