The plan to protect America by shooting down missiles mid-air


Donald Trump's proposed $175 billion missile-defense system, reminiscent of Reagan's SDI, aims for near-complete protection, although its feasibility remains questionable.
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IN THE 1980S scientists working on Ronald Reagan’s Strategic Defence Initiative proposed what seemed like a madcap scheme to defend America. Thousands of interceptor satellites would orbit Earth and attack enemy missiles as they took off. The idea fizzled out. It has been resuscitated by Donald Trump, who on May 20th said that his Golden Dome missile-defence shield would cost $175bn in total, take two to three years to complete and offer “close to 100%” protection.

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