HUNTSVILLE, Alabama—The U.S. general in charge of protecting North America claims the space-based sensor layer is “absolutely key” in defending the nation against hypersonic glide vehicles, but it was not included in the Pentagon’s fiscal 2020 budget request. The Pentagon included the Space Sensor Layer, formerly the Missile Defense Tracking System, in its fiscal 2020 unfunded requirements list. Air Force Gen. Terrence O’Shaughnessy, U.S. Northern Command ...


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