NSGA Winter Harbor Maine

Naval Security Group Activity (NSGA) Winter Harbor, Maine, was established in 1935 on the Schoodic Peninsula as a United States Navy radio intercept and direction-finding station. Originally part of the Navy's growing network of signals intelligence (SIGINT) sites, NSGA Winter Harbor played a crucial role during World War II and the Cold War, tracking enemy communications and supporting national security efforts. The facility operated advanced radio and cryptologic equipment, contributing vital intelligence for fleet and national decision-makers. NSGA Winter Harbor was decommissioned in 2002, with its property later transferred to the National Park Service to become part of Acadia National Park.