Japan is mobilizing its missile defense system, and U.S. Navy ships are deploying to the Sea of Japan, as North Korea prepares to launch a rocket that is expected next month, officials said.
Japan's move, aimed at shooting down debris from the launch that might fall into its territory, is notable for a country with a pacifist constitution.
The U.S. ships are capable of shooting down ballistic missiles, a Navy spokesman said. 
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CNN's Kyung Lah and Mike Mount contributed to this report
All About U.S. Navy • North Korea
