NSGA Kamiseya Japan

Naval Security Group Activity (NSGA) Kamiseya, Japan, was established in the early 1950s as a key U.S. Navy signals intelligence (SIGINT) facility during the Cold War. Located near Yokosuka, it played a vital role in intercepting and analyzing communications from the Soviet Union, China, and regional actors in the Western Pacific. The unit provided crucial intelligence support to U.S. and allied naval operations, particularly during the Korean and Vietnam Wars. NSGA Kamiseya operated until its closure in 1995, after which its missions were consolidated with other intelligence activities in the region.