Securing a declaration of war and specific authorization for the introduction of combat forces in subsequent years might well have been impossible not seeking it was certainly wrong " Ibid . Robert McNamara would not stay in the Johnson Presidency much longer . On November 1 , 1967 , McNamara sent his now famous top secret memorandum in which he advised President Johnson to scale back US troops involvement in Vietnam . This concern was never addressed by Johnson to McNamara and four months later in...











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