For four years, starting from 2009, the U.S. Missile Defense Agency spent $231 million trying to develop a new-class of space satellites that would detect missile launches and track warheads in flight with great precision.
An investigation by Los Angeles Times has revealed why the Precision Tracking Space System would never have worked.
Critics say the concept should not have proceeded beyond a study.
Proponents said only 12 satellites are needed to deter ballistic missiles fired by Iran or North Korea, but a panel of experts later found that at least 24 satellites are needed as the constellations altitude created a blind spot that misses missiles coming from the North Pole.
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