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After 9/11, the State Department allowed more and more Iranians to legally enter the United States through Diversity Visas, an immigration program that two government investigations have identified as a national security risk. Iran, among four other nations, is defined as a terror-sponsoring state by the State Department.

When Adm. James Stavridis takes charge of U.S. military operations in Latin America and the Caribbean in a change-of-command ceremony on Thursday, he becomes the first naval officer ever to run the Pentagon's Southern Command headquarters.