A U.S. soldier of 2nd Squadron, 14th Cavalry takes a retina scan of a refugee at a joint U.S.-Iraqi military security station in Sab al-Boor near Baghdad December 15, 2008. Residents who fled due to sectarian violence for the past two years from Sab al-boor are screened in the U.S.-Iraqi military station before they can return to their areas. REUTERS/Erik de Castro (IRAQ)