Unsurprisingly details are starting to emerge of how Bush and Rumsfeld damaged the honor and reputation of the U.S. and especially the U.S. military.
This Washington Post articles explains how the military's initial setup of Guantanamo featured humane treatment in accordance with the Geneva Conventions. Until orders came from on high.
Rumsfeld may very well be worse than McNamara. At least he didn't set out to destroy the honor of the military.