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Space Surveillance and Tracking System (SSTS)

The SSTS program was intended to provide space-based acquisition, tracking, and discrimination of incoming ballistic targets, consisting of the reentry vehicles (RVs) released by enemy missiles after their rocket engines have shut down. The system would have used long-wave infrared sensors to identify the RVs, which would have a significantly higher infrared signature than the cold background of space. However, the SSTS proved too large and too expensive to deploy in numbers sufficient to provide adequate coverage. As a result, this program has since been superceded by the much smaller and significantly less expensive SBIRS-High and SBIRS-Low platforms.

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