Workboats operate near the Transocean Development Drilling Rig II at the site of the Deepwater Horizon incident in the Gulf of Mexico earlier this month. Dave Martin/AP hide caption

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U.S. Marines lead an Afghan detainee toward their combat outpost for questioning in a Taliban stronghold area in Marjah, Helmand province, southern Afghanistan, April 1, 2010. The leak of more than 90,000 secret military intelligence reports on the war in Afghanistan paints a grim and often discouraging picture of the situation on the ground. Mauricio Lima/AFP/Getty Images hide caption

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The U.S. Computer Emergency Readiness Team/National Cybersecurity and Communications Integration Center is designed to help protect the technical infrastructure of the United States. Win McNamee/Getty Images hide caption

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Last month Chairman of the Joint Chiefs of Staff Michael Mullen testified in Washington on the Defense Department's fiscal 2011 budget. He said recently that debt was one of the biggest threats to the United States. Pablo Martinez Monsivais/AP hide caption

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Gen. William K. Harrison, Jr., seated at left, and North Korean Gen. Nam Il, seated at right, sign armistice documents in Armistice Hall in Panmunjom, a no man's land between the Koreas, on July 26, 1953. AP hide caption

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Employee Sean Tippett works in an operations room at the headquarters of Cisco Systems, a leading provider of Internet network technology, in San Jose, Calif. Experts are debating the need for Internet traceability for security purposes -- and what that would mean for online anonymity and civil liberties in places such as China and Iran. Paul Sakuma/AP hide caption

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Defense Secretary Robert Gates delivers the oath of office to Gen. Keith Alexander (right) during the activation ceremony of U.S. Cyber Command at Fort Meade, Md., last month. Cherie Cullen/AP/Department of Defense hide caption

itoggle caption Cherie Cullen/AP/Department of Defense

A North Korean soldier (left) and a South Korean soldier stand opposite each other at the demilitarized zone separating the two Koreas. Yonhap/AFP/Getty Images hide caption

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Director of National Intelligence Dennis Blair, seen here in February, offered his resignation Thursday. During the 16 months on the job, Blair struggled to establish his authority over the CIA and other U.S. intelligence agencies. Manuel Balce Ceneta/AP hide caption

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