Growing threats to satellites in space and changing missile threats on the ground are prompting the U.S. to modernize the satellite constellation designed to protect it against the world’s deadliest weapons. While the current Space-Based Infrared System (Sbirs)—which executes that nuclear missile-warning mission—is exceeding expectations, the U.S. will need a new, more survivable approach to counter technological advancements by rival nations by the mid-2020s, says Gen. ...


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