President Barack Obama and Iraqi Prime Minister Nouri al-Maliki participate in a wreath laying ceremony at Arlington National Cemetery December 12, 2011 in Arlington. (AFP OUT) U.S. President Barack Obama (L) and Iraqi Prime Minister Nouri al-Maliki participate in a wreath laying ceremony at Arlington National Cemetery December 12, 2011 in Arlington, Virginia. Al-Maliki is in Washington for talks ahead of the December 31 full withdrawal of U.S. troops from Iraq and the end of a deeply divisive nine-year war. President Barack Obama and Iraqi Prime Minister Nouri al-Maliki have placed a wreath by the Tomb of the Unknown Soldier at Arlington.