After more than a decade of reviewing how the U.S. will modernize its most important military satellite systems—such as those that detect nuclear missile launches—there are signs the Pentagon is finally moving toward decisions.  Lockheed Martin’s Space-Based Infrared System (SBIRS), first launched in 2011, currently fulfills the nuclear missile-warning mission with three satellites in geostationary orbit (GEO) and sensors riding on classified satellites in highly ...

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