RFK's brother signed an order to withdraw from Vietnam in October 1963 when the politics supported escalation.  Respectfully, you are misinformed.  JFK had been to Vietnam in 1951 and realized the French would likely lose.  In 1954, he was the politician in Congress denouncing the Eisenhower / Nixon / Dulles brothers plan to send nukes to Vietnam to help the French (who were losing at Dien Bien Phu).  If JFK had been allowed to stay in office the escalation in Vietnam would not have happened.