10/21/2026
ON THIS DAY IN U.S. AIR FORCE HISTORY: 1961 - The USAF launched MIDAS IV, a heat-sensing satellite that could detect missile launches, from Point Arguello, California into a 2,100-mile circular orbit. Under Project West Force, the Midas IV then ejected millions of copper wires to form a reflecting belt in space to aid radio communications. The wires failed to disperse as planned. A week into the mission, MIDAS IV died when its batteries ran down after failure of a solar panel.
The Missile Defense Alarm System, or MIDAS, was a U.S. system of 12 early-warning satellites that provided limited notice of Soviet intercontinental ballistic missile launches between 1960 and 1966. Originally, it was intended to serve as a complete early-warning system working in conjunction with the Ballistic Missile Early Warning System, or BMEWS. Cost and reliability concerns limited the project to a research and development role.
Three of the system's 12 launches ended in failure, and the remaining nine satellites provided crude infrared early-warning coverage of the Soviet Union until the project was replaced by the Defense Support Program satellite system. Though MIDAS failed in its primary role as a system of infrared early-warning satellites, it pioneered the technologies needed in successor systems.