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Security | Janet Napolitano takes over a huge department that has even bigger demands on it | Jamie Dean

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In a physics laboratory in Iran, Mohsen Fakrizadeh developed a top-secret project with a disturbing goal: UN investigators say the Iranian military officer spearheaded "Orchid Office"—a project that included efforts to develop a long-range missile to carry an atomic device.

UN officials aren't sure how far Iran has advanced in its nuclear capabilities, but the organization's nuclear watchdog said this much in February: The regime has enough enriched uranium for one nuclear bomb.

Iranian officials say their nuclear goals are aimed at generating electricity, a dubious claim from a country with a president that has called the United States "Satanic" and said that Israel is "about to die and will be soon erased from the geographical scene." When Iranians celebrated last month the 30th anniversary of the revolution that brought to power the Ayatollah Khomeini, crowds filled the streets of Tehran, chanting: "Death to America."