The call, by 6 or 7 retired military officers, for Rumsfeld to resign is pointless at best. All the people in the military have been schooled in the "Just War" theory of warfare. It is taught in all our military academies and it is profoundly wrong. Whomever would replace Rumsfeld would make only minor differences. They would still work for Bush.
For an explaination as to why "Just War" is wrong, Capitalism Magazine has a good article by Nicholas Provenzo here. For an in-depth study follow his links to the Objective Standard.