NSGA Skaggs Island

Naval Security Group Activity (NSGA) Skaggs Island was a United States Navy installation located near Vallejo, California, operational from 1942 to 1993. Originally established during World War II as a radio intelligence and direction-finding station, its primary mission was signals intelligence (SIGINT) collection and cryptologic operations throughout the Cold War. NSGA Skaggs Island played a vital role in monitoring and intercepting communications of potential adversaries, supporting national defense and fleet operations across the Pacific. The station was decommissioned in 1993 as part of broader post-Cold War military restructuring, and the property was later transferred to the U.S. Fish and Wildlife Service.