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The U.S. military has retired its Defense Support Program (DSP), a constellation of infrared satellites that watched for missile launches. The retirement does not mean the United States has stopped monitoring for launches: the newer Space-Based Infrared System (SBIRS) is already deployed, and Next-Generation Overhead Persistent Infrared (Next-Gen OPIR) is planned as its eventual successor.
What happened to the Defense Support Program?
Ars Technica reported on October 2, 2026, that the final two surviving DSP satellites retired after an on-orbit maneuvering exercise in early September. The report says the Space Force confirmed the program’s official retirement. It identified the satellites as presumably DSP-20 and DSP-22; independent orbital tracking cited in the report showed both raising their orbits by a few hundred kilometers, a maneuver typically associated with moving satellites above geostationary space into graveyard orbits. Because the linked Space Force announcement was not directly accessible, the satellite identities and maneuver details are attributable to Ars Technica, not independently confirmed here. Read Ars Technica’s October 2, 2026 report.
U.S. Space Force Col. Brandon Davenport, commander of Mission Delta 4, described DSP as “foundational to the defense of our nation.” He said the final satellites marked the end of “over a half century of space-based early warning,” adding that DSP supported deterrence during the Cold War and protected deployed warfighters from the Gulf War until their retirement. Ars Technica reported that DSP satellites had flown for more than 55 years.
What was DSP designed to do?
DSP was a military infrared satellite constellation built to detect missile launches. Its early geosynchronous satellites watched for the heat signatures associated with launches, initially to help identify Soviet intercontinental ballistic missiles. The system also proved useful outside the nuclear-warning mission: DSP helped detect Iraqi Scud launches during the Gulf War, according to the Ars Technica account.
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That early-warning role is distinct from the broader U.S. missile-warning enterprise. Satellites are one part of a system that also includes ground-based sensors and the processing and communication systems used to share warning information. The Congressional Research Service (CRS) describes missile-warning radars and the integration of space- and ground-based warning information in its overview of nuclear command, control, and communications (NC3). CRS, “Defense Primer: Nuclear Command, Control, and Communications,” updated January 8, 2026.
What replaces DSP?
DSP’s successor is not a future program waiting to come online. The Space Force began deploying SBIRS in 2011, and CRS describes it as the replacement for the 1970s-era DSP satellites. SBIRS combines satellites and ground systems to detect and track adversary missile launches, using sensors in geosynchronous and highly elliptical orbits.
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Next-Gen OPIR is intended to replace the aging SBIRS constellation, not DSP directly. CRS describes a planned architecture of geosynchronous satellites, polar-orbiting satellites, and a ground system. Space Systems Command says the effort is part of delivering space-based missile warning, tracking, and defense, with improved resilience as a goal. A Space Systems Command account published in 2022 described three planned geosynchronous satellites built by Lockheed Martin and two planned polar-orbiting systems built by Northrop Grumman. Those figures describe the plan at that time, not a current launch schedule. Space Systems Command, “Space Sensing: Overhead Persistent Infrared”.
How DSP, SBIRS, and Next-Gen OPIR differ
| System | Role in the transition | Space and ground architecture | Status reflected in the sources |
|---|---|---|---|
| Defense Support Program (DSP) | Legacy U.S. space-based infrared missile-launch warning system. | Legacy geosynchronous satellites; the cited account does not detail a DSP ground-system architecture. | Ars Technica reported the program’s retirement in September 2026 after more than half a century of service. |
| Space-Based Infrared System (SBIRS) | DSP’s deployed replacement for detecting and tracking adversary missile launches. | Satellites in geosynchronous and highly elliptical orbits, plus ground systems. | Deployment began in 2011, according to CRS’s January 2026 account. |
| Next-Gen OPIR | Planned eventual successor to SBIRS. | CRS describes geosynchronous and polar-orbiting satellites plus a ground system; Space Systems Command identifies resilience as a program goal. | In development as the next generation of space-based warning and tracking; the cited CRS primer does not give a current launch schedule. |
Why the transition took decades
SBIRS itself had a difficult acquisition history. In a 2007 review, the Government Accountability Office said the Department of Defense initiated the program in 1996 to replace the then-current missile detection system and add intelligence, surveillance, and reconnaissance capabilities. GAO reported technical challenges, cost growth, and schedule delays: at the time, the program estimate exceeded $10.4 billion and the first satellite launch was expected in 2008. The original plan had called for fielding by 2004 at about $4.2 billion. Those are historical estimates and expectations from 2007, not current SBIRS costs or a present-day schedule. GAO, “Space Based Infrared System High Program and its Alternative,” September 12, 2007.
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Does DSP’s retirement leave the U.S. without missile-warning satellites?
No. The system that ended is DSP, not the missile-warning mission. CRS says SBIRS had already begun replacing DSP years before the last DSP satellites retired, and describes Next-Gen OPIR as the planned follow-on to SBIRS. The retirement therefore closes a long-running satellite program while the broader warning network continues through newer space systems and ground-based sensors.
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