In Iraq the run up to this anniversary has been marked with the continued violence.
On Tuesday Dick Cheney, the US vice president, made a surprise visit to the country and called the war a "successful endeavor".
He also promised Nuri al-Maliki, the Iraqi prime minister, the unwavering support of the US.
When George Bush, the US president, warned in a 2003 speech that this conflict "could be longer and more difficult than some predict," perhaps no one realised how long the US involvement in Iraq would be.
On the next show author and journalist Jonathan Steele discusses Iraq five years on.
Steele has covered the Iraq war since the beginning as a senior correspondent for the British national newspaper The Guardian.
His latest book is called Defeat: Why America and Britain Lost Iraq.Watch this episode of Riz Khan on YouTube
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