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BAGHDAD, IRAQ - DECEMBER 15:  U.S. military color guard march during a casing ceremony where the United States Forces- Iraq flag was retired, signifying the departure of United States troops from Iraq, at the former Sather Air Base on December 15, 2011 in Baghdad, Iraq. United States forces are scheduled to entirely depart Iraq by December 31, there are currently around 4,000 troops remaining in Iraq. (Photo by Mario Tama/Getty Images) Mario Tama / Getty Images