I’m not interested in words, but deeds.
Rumsfeld mishandled both the Iraq and Afganistan wars. One reason islamic extremism is on the rise is that there is now a perception that the USA can be checked, if not outright defeated.
And I lay much of the blame for that on Rumsfeld’s casual arrogance.
You might want to read the book first.
Iraq was basically taken down with an assault force of 2.5 divisions. Speed & mobility compensated for the lack of mass. It was brilliant and Rumsfeld deserves credit for approving the plan.
The only thing that I find fault with was that when the 4th ID was finally inserted that the original invasion units were pulled back too quickly. We got the insurgency, which got out of hand for a period. Then again you have to balance that off with all the other things that DID NOT HAPPEN, like a war on the Korean Peninsula.
Sometimes the best plan gets negated by an opportunistic opponent acting aggressively.