Feb 2006:
85% of troops say the U.S. mission
is mainly to retaliate for Saddam's role in 9-11

Aug 2006:
Bush says Iraq had nothing to do with 9/11.
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More on what the troops think:

An overwhelming majority of 72% of American troops serving in Iraq think the U.S. should exit the country within the next year, and more than one in four say the troops should leave immediately, a new Le Moyne College/Zogby International survey shows....

While 85% said the U.S. mission is mainly "to retaliate for Saddam's role in the 9-11 attacks," 77% said they also believe the main or a major reason for the war was "to stop Saddam from protecting al Qaeda in Iraq." (Both False: Saddam had no ties to al-Qaeda, no role in 9/11)