A rocket designed to intercept an intercontinental ballistic missile is launched from Vandenberg Air Force Base in California on Tuesday. The Pentagon says it shot down a mock warhead over the Pacific in a success for the U.S. missile defense program. Matt Hartman/AP hide caption

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Matt Hartman/AP

North Korean leader Kim Jong Un is shown on a TV at the Seoul Railway Station in South Korea on Sunday, when North Korea test-launched a "medium long-range" missile that landed in the waters between Japan and the Korean Peninsula. Ahn Young-joon/AP hide caption

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Ahn Young-joon/AP

People watch a TV news program showing a file image of a previous missile launch conducted by North Korea at the Seoul Railway Station in Seoul. North Korea on Sunday test-launched a ballistic missile that landed in the Sea of Japan, the South Korean, Japanese and U.S. militaries said. Ahn Young-joon/AP hide caption

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Ahn Young-joon/AP

A man watches a TV news program showing a file image of missile launch conducted by North Korea, at the Seoul Railway Station in Seoul, South Korea, on Oct. 20. The U.S. military said it detected a failed North Korean missile launch that day. The U.S. Strategic Command issued a statement late Wednesday saying it presumed the missile was a Musudan intermediate-range ballistic missile. Lee Jin-man/AP hide caption

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Lee Jin-man/AP

Even With Failures, North Korea's Nuclear Program Races Ahead

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