What happens when North Korea launches a missile?

When North Korea does a missile test, American personnel go to work sifting through piles of data. They've been able to paint a picture of what a North Korean ICBM goes through after launch

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When North Korea develops the capability to hit the continental U.S. with a nuclear-tipped missile, the National Air and Space Intelligence Center will be among the first of America's military units to know. For the first time, NASIC allowed network television cameras into its operations center at Wright-Paterson Air Force Base near Dayton, Ohio, for a 60 Minutes report by David Martin on its capabilities and assessments of the North Korean nuclear threat. Martin's report will be broadcast on 60 Minutes Sunday, Oct. 29 at 7:00 p.m. ET/PT.