U.S. Secretary of State Hillary Clinton walks out from the Pentagon in Washington after attending a news briefing on the new Nuclear Posture Review April 6, 2010. The Obama administration, kicking off an intensive week of nuclear diplomacy, unveiled a revamped policy on Tuesday restricting U.S. use of its atomic weapons stockpile. REUTERS/Yuri Gripas (UNITED STATES - Tags: POLITICS MILITARY ENERGY)
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