This photo provided by the Defense Department's Missile Defense Agency, taken Jan. 28, 2016, shows a long-range ground-based interceptor is launched from Vandenberg Air Force Base, Calif. As North Korea rattles its nuclear saber and threatens to bomb the U.S. at any moment, a nerve-jangling question hangs in the air: If North Korea did launch a nuclear-armed missile at an American city, could the Pentagon's missile defenses shoot it down beyond U.S. shores? (Defense Department's Missile Defense Agency via AP) ** FILE **
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