Fu SZ Guichen is a former French military command and communications facility located in western France. The site was part of France's strategic nuclear deterrence infrastructure during the Cold War era. As a Fixed Strategic Command Post (Fu SZ), it served as a hardened communications center for coordinating France's nuclear forces and maintaining command and control capabilities in the event of a nuclear conflict.
The facility reflects France's independent nuclear deterrent strategy, which has been a cornerstone of French defense policy since the 1960s. The site's location in Brittany provided strategic positioning for communications across France's nuclear command network. During the Cold War, such facilities were essential for maintaining secure communications between France's political leadership and its nuclear forces, ensuring the country could maintain a credible deterrent posture.