U.S. soldiers of the 1st Platoon Alpha company 2nd Battalion 12th Cavalry Regiment arrive at a police station in Baghdad's Al-Ghazaliyah neighbourhood March 19, 2007. March 20 mark the 4th anniversary of the US-led invasion of Iraq in 2003 and more than 3200 U.S. troops have been killed since then.(Xinhua/Reuters Photo) Photo Gallery>>>

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