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" Having reviewed the record in detail, and with the advantage of hindsight, I think it highly probable that, had President Kennedy lived, he would have pulled us out of Vietnam. He would have concluded that the South Vietnamese were incapable of defending themselves, and that Saigon’s grave political weaknesses made it unwise to try to offset the limitations of South Vietnamese forces by sending U.S. combat troops on a large scale. I think he would have come to that conclusion even if he reasoned, as I believe he would have, that South Vietnam and, ultimately, Southeast Asia would then be lost to Communism. "
― Robert S. McNamara , In Retrospect: The Tragedy and Lessons of Vietnam