During the Cold War, the U.S. government built a network of radar stations across the northern states, including Wisconsin, to detect incoming Soviet bombers. One of these stations, the Calumet Air Force Station, sat on the edge of the Northwoods, scanning the skies for potential threats. The station was manned by Air Force personnel who endured brutal winters to keep round the clock watch. The station was decommissioned in the 1980s, and today, little remains beyond crumbling infrastructure and the lingering memory of an era when the biggest threat to the Northwoods wasn't the cold, but what might come from above.