Shortly after the start of the Korean War in the early 1950s, the Soviet Union successfully completed its own production of an atomic bomb. With the looming threat of nuclear war, the United States began the massive installation of radar stations to protect its perimeter. One of the highest threats came from the north, as Soviet pilots had a straight shot to the northern US via arctic routes. To defend against this, a radar station was built in the rural outreaches of the Keweenaw Peninsula as a part of the Semi-Automatic Ground Movement (SAGE).
- Busch, Jane. “Copper Country Survey; Final Report and Historic Preservation Plan.” United States National Park Service.
- “Red Scare.” History.com, E+A Networks, 2010.
- Stanton, John. “Calumet Air Force Station.” FortWiki.
- Stanton, John. “SAGE Introduction.” FortWiki.