A timeline of U.S. military involvement in Iraq since the terrorist attacks of Sept. 11, 2001:
Dec. 28: Amid the hunt for Osama bin Laden, President Bush, his advisers and Army Gen. Tommy Franks focus on planning for war in Iraq.
July 8: President Bush promises to "use all the tools at our disposal" to bring down Iraqi President Saddam Hussein.
March 19-20: The U.S.-led invasion of Iraq to overthrow Saddam begins.
May 1: Bush declares "major combat operations in Iraq have ended."
Summer 2003: Attacks by an Iraqi insurgency grow and U.S.-led coalition's troop casualties mount.
Dec. 13: Saddam is captured.
April: Photographs emerge of prisoner abuse at Iraq's Abu Ghraib prison, triggering an international outcry.
June 28: The U.S. occupation authority turns formal power over to interim Iraqi government.
Oct. 6: The top U.S. arms inspector in Iraq finds no evidence that Saddam Hussein's government produced weapons of mass destruction after 1991 -- the primary reason the Bush administration had given for going to war.
Timeline: U.S. Involvement in Iraq
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