President Trump's missile defense project, called the "Golden Dome for America," aims to protect the U.S. from foreign threats. But it has a steep price and has been criticized by China as threatening to increase the risks of militarizing space and a global arms race.

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The project will cost about $175 billion, Trump said, and will be led by Gen. Michael A. Guetlein, vice chief of space operations at the United States Space Force.