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上瀬谷通信施設 (Kamiseya Tsūshin Shisetsu)

上瀬谷通信施設(かみせやつうしんしせつ)は神奈川県横浜市旭区上川井町と瀬谷区北町・瀬谷町にあった在日アメリカ海軍基地。「上瀬谷基地」とも呼ばれる。 1945(昭和20)年8月、終戦により旧日本海軍横須賀海軍資材集結所であった当所を米軍が接収する。1947(昭和22)年に接収が解除されるものの、1951(昭和26)年に米海軍により再接収され、通信基地となった。 アメリカ国防総省の諜報機関であるアメリカ国家安全保障局(NSA)の電波受信の施設で、諸外国の通信傍受や暗号解読、スパイの訓練などが行われていたという。100基以上の短波固定アンテナ、10基の回転指向性アンテナ、超短波・マイクロ波無線塔2本などが設置されていた。 冷戦の終結により大部分が他の施設へ移駐し、2003(平成15)年には第1哨戒偵察航空団司令部が三沢飛行場に移転。2015(平成27)年6月30日、当施設を含めた土地全体、約242ヘクタールという広大な敷地が日本へ返還された。 跡地の45%は国有地、45%が民有地、残りが通路・水路などの市有地となっており、一部に施設跡が残る。施設跡は極めて厳重に管理されている。

Kamisaya communication facility

Uiseya Communication Facility (Kamiaseya Shishi Setsu) is a US Navy base in Japan, located in Kamikawaicho, Asahi Ward, Yokohama-shi, Kanagawa Prefecture, and Kitaya, Seya Ward, Seya Ward. It is also called "Kaiseya base". By the end of the war in August 1945, the US Army seized the former Japanese Navy Yokosuka Naval Materials Collection Center. Although seized was canceled in 1947 (Showa 22), it was re-received by the US Navy in 1951 (Showa 26), and it became a communication base. It has been reported that the interception, cryptanalysis, and spy training of foreign countries were conducted at the radio reception facility of the US National Security Agency (NSA), an intelligence agency of the US Department of Defense. 100 or more shortwave fixed antennas, 10 rotating directional antennas, 2 very high frequency / microwave radio towers, etc. were installed. Most of them moved to other facilities at the end of the Cold War, and in 2003, the first patrol and reconnaissance wing headquarters moved to Misawa Airfield. On June 30, 2015, the entire site including our facilities, a vast site of about 242 hectares was returned to Japan. Forty-five percent of the ruins are state-owned lands, 45% are privately-owned lands, and the rest are city-owned lands such as walkways and waterways. The site remains very strictly managed.

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