Obviously, it was all about ridding the world of Saddam Hussein.
Can you imagine what it's been like for those soldiers? More than 20 years worth of atrocities committed by the Butcher of Baghdad. All of those innocent Iraqi civilians killed. The mass graves. The prisons. Damn! It must have laid heavy on the heart of every soldier who went to Iraq.
All those years of keeping their emotions in check. Carefully training and waiting for the day when they could finally liberate the Iraqi people. I'm sure many of them were just itching to go as soon as they possibly could, knowing that every day they waited, meant more innocent Iraqis were going to die.