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This artist's rendering shows a Northrop Grumman-built Defense Support Program (DSP) satellite in its role as an orbiting sentry. For over 30 years, these satellites have played a vital role in the nation's defense by detecting and reporting on missile launches. Northrop Grumman Space Technology builds the DSP satellite for the U.S. Air Force Space & Missile Systems Center, and integrates the sensor provided by Northrop Grumman Electronic Systems.