Don't forget LBJ.
There’s no denying that LBJ tried to micromanage the war from the Oval Office, a terrible thing to do. I still think it was McNamera that skewed his vision of how the war should be waged.
So what you kind of had was Johnson making the formal decisions after McNamera had counseled him improperly.
That’s my take on it. I may be wrong. People who disagree should set me straight.