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Defense Support Program

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    Space Force Retires Its Last Defense Support Program Satellites▼Defense Support Program: Space Force Retires Its Last DSP Satellites✉newsScienceSpace Policy15 min ago

    The US Space Force has retired the final satellites of the Defense Support Program, the Cold War-era infrared constellation that for decades provided early warning of ballistic missile launches. The aging spacecraft are being replaced by newer Space-Based Infrared System satellites, closing out a program that began in the early 1970s and marked a long-running chapter of American military space history.