Remember Rageh Omaar, who reported from Baghdad for the BBC when the Iraq war began in 2003? This is how he reported the arrival of US forces in Baghdad and the toppling of Saddam's statue in April 2003. Here you can see President George W Bush claiming "Mission accomplished" aboard the US aircraft carrier Abraham Lincoln in early May 2003.
All because of 9/11. This video shows the second plane hitting the Twin Towers of the World Trade Centre in New York. You can hear the newscasters gasp. What a terrible tragedy. I remember watching it on CNN and couldn't believe my eyes. It was like the end of the world.
As the last US combat brigade pulls out of Iraq, leaving behind more than 50,000 US soldiers in the country, here's a moment of remembrance: