I kind of agreed with the military top brass at the time, we could accomplish the first two phases for going to war, the mission being regime change but would likely fail or have problems with fulfilling the other phases that follow after accomplishing the main mission.
Bush and Rumsfeld were warned that you would need a minimum of 400,000 boots on the ground to occupy. Rumsfeld responded you go to war with the military you have.
I never cared that much for Rumsfeld, he always reminded me of McNamara.
But on the day our troops crossed the line and entered Iraq I had to support the troops because never again do I want to see Americans back stabbing our troops again like what happened during the Vietnam War.