The SAGE system was a massive computer-based air defense network designed to detect and respond to potential airborne threats. Developed in the 1950s, SAGE was a collaboration between IBM, the Massachusetts Institute of Technology (MIT), and the US Air Force. The system used a combination of radar, computers, and communication systems to provide real-time surveillance and tracking of aircraft. SAGE was designed to be a semi-automatic system, allowing human operators to make decisions based on the data provided by the system. The system was first deployed in 1958 and played a critical role in the US air defense system during the Cold War. SAGE was a massive undertaking, requiring the development of new technologies and the construction of large computer centers. The system used IBM’s AN/FSQ-7 computer, which was one of the first commercial computers to be developed. The AN/FSQ-7 was a massive machine, weighing over 275 tons and using over 49,000 vacuum tubes. Despite its size, the AN/FSQ-7 was a powerful computer, capable of processing large amounts of data in real-time. The SAGE system was also notable for its use of a new programming language, called SOP (Special Operations Program), which was developed specifically for the system. SAGE was a major innovation in air defense, providing a level of automation and real-time surveillance that was previously unimaginable. The system played a critical role in the US air defense system, providing early warning of potential threats and allowing for rapid response. Over the years, SAGE underwent several upgrades and improvements, including the addition of new radar systems and the development of more advanced computers. Despite being decommissioned in the 1980s, the SAGE system remains an important part of IBM’s history and a testament to the company’s innovative spirit. The development of SAGE also had a significant impact on the development of modern air defense systems, paving the way for the advanced systems in use today. In addition to its military applications, the SAGE system also had a significant impact on the development of civilian air traffic control systems. The system’s use of real-time surveillance and automation paved the way for the development of modern air traffic control systems, which rely on similar technologies to manage air traffic. Overall, the SAGE system was a groundbreaking innovation that played a critical role in the US air defense system and paved the way for the development of modern air defense and air traffic control systems.