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Djiboutian soldiers arrive as part of the African Union peacekeepers for Somalia (AMISOM), at the Adan Abdulle International airport in Somalia's capital Mogadishu, December 20, 2011. AMISOM is an African Union force that has been largely responsible for keeping al Shabaab from ousting Somalia's internationally-backed but weak government. REUTERS/Omar Faruk (SOMALIA - Tags: SOCIETY CIVIL UNREST POLITICS MILITARY) REUTERS