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Newly-recruited Iraqi volunteers, loyal to Shiite cleric Moqtada al-Sadr, in army uniforms take part in a training on June 19, 2014 in the capital Baghdad as thousands of Shiite volunteers join Iraqi security forces in the fight against Jihadist militants who have taken over several northern Iraqi cities. Iraqi Prime Minister Nuri al-Maliki ordered back to duty security officers not currently serving in active units to bolster forces battling a militant offensive that has overrun swathes of territory. AFP PHOTO/AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
Newly-recruited Iraqi volunteers, loyal to Shiite cleric Moqtada al-Sadr, in army uniforms take part in a training on June 19, 2014 in the capital Baghdad as thousands of Shiite volunteers join Iraqi security forces in the fight against Jihadist militants who have taken over several northern Iraqi cities. Iraqi Prime Minister Nuri al-Maliki ordered back to duty security officers not currently serving in active units to bolster forces battling a militant offensive that has overrun swathes of territory. AFP PHOTO/AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)

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Former chief of U.S. Central Command Gen. Anthoni Zinni (Ret.) on CNN's "The Lead with Jake Tapper."