661st Radar Squadron

The **661st Radar Squadron** was an Air Defense Command unit of the United States Air Force, activated in 1949. Stationed primarily at Selfridge Air Force Base, Michigan, it was tasked with operating and maintaining radar systems for the early detection and tracking of potential airborne threats during the Cold War. The squadron played a vital role in North American air defense, providing continuous surveillance and contributing data to the Semi-Automatic Ground Environment (SAGE) system. The unit was inactivated in 1974 as advances in technology and changes in defense priorities led to the reorganization of air defense assets.