BTW, LTG Davidson obviously has a more personal and informed opinion about Vietnam than I do but I would point out that numerous Vietnamese generals have admitted they were within 2-3 months of collapsing when Nixon and Kissinger gave them everything they wanted, that they couldn't have won without the backbiting from the press (like Sheehan) and "useful idiots" (to use one of Lenin's terms). IIRC, MacArthur begged Johnson to not expand the effort in Vietnam from his deathbed. OTOH, it's hard to say what would have happened if the American Left hadn't undermined everything on the homefront. I've got zero respect for Johnson and the way he expanded and interfered with the Vietnam War but I rather suspect that if WW II would have been the same kind of disaster if Roosevelt had been hit with the same kind of domestic resisteance that Johnson/Nixon/Bush had to contend with.