FILE - In this undated file image posted by the Raqqa Media Center, a Syrian opposition group, on Monday, June 30, 2014, which has been verified and is consistent with other AP reporting, fighters from the Islamic State group sit on a tank during a parade in Raqqa, Syria. The Islamic State group is often described as the most fearsome jihadi outfit of all: a global menace outweighing al-Qaida, with armies trembling before its advance. But while the group has been successful at seizing parts of Iraq and Syria, it is no unstoppable juggernaut. (AP Photo/Raqqa Media Center, File)
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