---
title: "U.S. Military Ends 50-Year Satellite Watch for Nuclear Missile Launches"
description: "The last Defense Support Program satellites, built to spot Soviet ICBMs, stopped flying operationally last month."
author: "rews desk"
published: 2026-10-02T17:32:14Z
modified: 2026-10-02T21:33:59Z
url: https://rews.cc/a/u-s-military-ends-50-year-satellite-watch-for-nuclear-missil-1d25eb
language: en
tags: ["military", "space", "missile", "satellite", "defense", "us", "science"]
publisher: "Rews (https://rews.cc)"
---

# U.S. Military Ends 50-Year Satellite Watch for Nuclear Missile Launches

*The last Defense Support Program satellites, built to spot Soviet ICBMs, stopped flying operationally last month.*

By rews desk · October 2, 2026 · https://rews.cc/a/u-s-military-ends-50-year-satellite-watch-for-nuclear-missil-1d25eb

## In brief

- The U.S. military retired the last Defense Support Program missile-warning satellites in September
- The program began with a secret 1970 launch from Cape Canaveral aboard a Titan IIIC rocket
- Early satellites carried about 2,000 infrared detectors; later ones had more than 6,000
- DSP-16 launched on the space shuttle Atlantis in 1991, and satellite launches ran until 2007
- A newer missile-warning system is replacing the constellation, according to Ars Technica

The U.S. military has retired the last of the satellites that watched for nuclear missile launches for more than 50 years, quietly ending one of its longest-running space programs in September.

The constellation, known as the Defense Support Program, was for decades among the most important the United States flew. Built to detect the launch of a nuclear warhead at the country, it was a primary element of American military space power during the Cold War. A newer missile-warning system is taking its place, according to Ars Technica, which reported the retirement on Friday.

The program began in late 1970, when a Titan IIIC rocket carried a top-secret payload off Space Launch Complex 40 at what was then Cape Canaveral Air Force Station. The government later disclosed that the payload was the first Defense Support Program satellite.

The first block of satellites, launched from 1970 to 1973, weighed about one metric ton each and carried about 2,000 infrared detectors — very sensitive telescopes, in effect, stationed in geosynchronous orbit. They turned experimental infrared observation into a continuous watch on the globe. Built to spot Soviet intercontinental ballistic missiles, they later proved useful in conventional war too, detecting Iraqi Scud missile launches.

The military kept enlarging the constellation, improving reliability and adding capabilities. Later satellites carried more than 6,000 infrared detectors and weighed about 2.5 tons, and launches continued until 2007. One of them, DSP-16, went up on the space shuttle Atlantis in 1991.

The pad the first satellite left from has changed hands more than once since. The Titan IIIC flew its last mission in 1982, after dozens of launches, and other Titans used the complex until 2005, when the Air Force, over the objections of United Launch Alliance, turned it over to a small, largely unknown startup called SpaceX. The cape is a Space Force station now.

The payloads outlasted the rockets, the pad’s owners and the Cold War itself. Until last month, some of them were still working.