"Rumsfeld publicly humiliated all who dissented, beginning with Army Chief of Staff Gen. Eric Shinseki, who was virtually dismissed the day he honestly gave his views to Congress. Rumsfeld's deputy, neoconservative ideologue Paul Wolfowitz, listened respectfully before rejecting the generals' advice. As the Iraqi insurgency grew, the generals found Rumsfeld "completely unable and unwilling to understand the collapse of security in Iraq," says Maj. Gen. Eaton. The severely understrength US forces have never been able to provide adequate security. Once Iraqi civilians lost their trust and confidence in America's protection, the war was lost politically. As General Newbold says: "Our opposition to Rumsfeld is all about his accountability for getting Iraq wrong from day one.""
Whalen puts together a piece that outlines why the military is extremely concerned that the occupation of Iraq not fully mirror Vietnam in every facet. It is a highly recommended read.