Standard Operating Procedure from Errol Morris (see my capsule review) contains two US quotes that seem to me to sum up why Iraq is Vietnam all over again.
An army investigator:
This was in Iraq, like Vietnam, will probably get remembered as the one time that we were not the heroes, we were not the saviours.
A contractor interrogator:
If we leave, they’re killing each other and not killing us. If we stay, they’re killing each other and and they’re killing us. That’s the end result of this whole fucking debacle.