The United States Space Force has officially retired the final two operational satellites belonging to the Defense Support Program, closing a chapter on more than fifty years of space-based early warning operations. Launched initially during the Cold War in late 1970, the DSP constellation was built to monitor the globe for ballistic missile attacks and provide critical strategic alerts to military leadership.
Positioned roughly 22,300 miles above Earth in geosynchronous orbit, the satellites relied on specialized infrared detectors to track intense thermal signatures and missile plumes. Operating by continuously spinning and scanning the planet's surface roughly six times per minute, these spacecraft laid the operational groundwork for modern military infrared observation. Over a span of decades, the program expanded through 23 total satellite launches between 1971 and 2007, seeing technological upgrades that boosted sensor counts from 2,000 to 6,000 detectors and extended individual lifespans past 12 years.
While initially designed to counter Soviet nuclear threats, the network adapted to conventional conflicts, famously detecting Iraqi Scud missile launches during Operation Desert Storm in the early 1990s. Beyond military utility, the infrared sensors occasionally tracked natural phenomena, spotting early signatures of volcanic eruptions and forest fires. Last month, the final two operational units were boosted into a higher disposal orbit ahead of the formal program decommissioning.
The retirement clears the path for newer defense infrastructure, including the Space Based Infrared System launched in 2011 and subsequent next-generation overhead persistent infrared assets currently in development. U.S. Space Force Col. Brandon Davenport noted in a statement that the constellation successfully provided deterrence and protected deployed personnel across multiple eras of conflict before reaching this final milestone.
US Space Force Retires Last Defense Support Program Satellites
Comments