North Korean leader Kim Jong Un said he would boost national defenses to cope with what he called an unprecedented U.S.-led confrontation.
It has been decades since the Air Force last developed a nuclear missile, the secretary says, and surprise issues are cropping up.
An unarmed U.S. intercontinental ballistic missile was intentionally destroyed when something went wrong during a test launch from California.
Test launches ensure America’s land-based nuclear missiles are still viable after more than 50 years.
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