Libyan Foreign Minister Moussa Koussa speaks during a press conference in Tripoli on March 19. Koussa arrived in Britain on March 30, and told the British government that he was resigning from his post. Mahmud Turkia/AFP/Getty Images hide caption

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The USS Barry launches a Tomahawk missile, targeting radar and anti-aircraft sites along Libya's Mediterranean coast on Saturday. U.S. Navy/Getty Images hide caption

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The north entrance to the Greenbrier gives no clues to a secret bunker for Congress. Courtesy of The Greenbrier Resort hide caption

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A young Moroccan watches a video on Feb. 17, calling for demonstrations. Three days later, the demonstration organized by a coalition of groups took place in cities throughout the country. U.S. intelligence officials say that in hindsight, using open sources like Facebook and Twitter could have helped them predict the uprisings that have swept the Arab world. Abdelhak Senna/AFP/Getty Images hide caption

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FBI Director Robert Mueller, shown with National Counterterrorism Center Director Michael Leiter, testifies last September on Capitol Hill at a hearing called "Nine Years After 9/11: Confronting the Terrorist Threat to the Homeland." Mueller's 10-year term expires in September. Leiter is reportedly among those being considered to replace him. Jim Watson/AFP/Getty Images hide caption

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