Joint Chiefs Chairman Gen. Martin Dempsey speaks during a news conference at the Pentagon in December. Manuel Balce Ceneta/AP hide caption

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Rebel fighters drink tea on the front line of Ramouseh, near the Aleppo Artillery School. President Obama has requested $500 million to arm and train "moderate" Syrian rebel groups. Hosam Katan/Reuters/Landov hide caption

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Fighting between Iraqi government forces and the Islamic State of Iraq and Syria leaves buildings destroyed in Ramadi on Tuesday. AFP/Getty Images hide caption

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An unmanned U.S. Predator drone flies over Kandahar Air Field, southern Afghanistan, in 2010. A new report questions the U.S. policy of using armed drones abroad to carry out attacks on suspected terrorists. Kirsty Wigglesworth/AP hide caption

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Fighters from the Islamic State of Iraq and Syria march in Raqaa, Syria, in a picture posted on Jan. 14. The group is believed to hold as much as $2 billion. AP hide caption

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