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In this Nov. 13, 2012 file photo, obtained from the Iranian Mehr News Agency, Iranian army members prepare missiles to be launched, during a maneuver, in an undisclosed location in Iran. President Barack Obama pledged in the campaign, and since, that he will not let Iran develop nuclear weapons. According to his own timeline, Obama has about a year left to see if his policy of diplomacy and sanctions can get Iran to slow its enrichment of uranium and assure the world its nuclear program is peaceful. Resolving the standoff while avoiding war ranks among the biggest foreign policy challenges of Obama's second term. And time grows short. Majid Asgaripour/AP
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