In 1963 JFK Ordered the End of Vietnam War. All Troops Out by the End of 1965. But Then He was Assassinated and We Fought the War until 1973.

JFK Had Ordered Full Withdrawal from Vietnam: per National Security Action Memorandum Number 263.

https://whowhatwhy.org/politics/government-integrity/jfk-ordered-full-withdrawal-vietnam-solid-evidence/

What I Wonder is Who Benefited from Continuing the Vietnam War? Dow Chemical sold a Lot of Agent Orange and Napalm. Hughes Aircraft Sold a Lot of Helicopters. The CIA Exported Tons of Heroin out of Laos... Financing their Operations Worldwide... This is Something I was Not Taught in School... nor did anyone mention it in all the conversations I've Had about the War and The Assassination... 

Was this the Real Motive for Kennedy's Assassination? To Keep the Vietnam War Going.

https://www.bostonreview.net/articles/galbraith-exit-strategy-vietnam/

On October 2, 1963, Kennedy received the report of a mission to Saigon by McNamara and Maxwell Taylor, chairman of the Joint Chiefs of Staff (JCS). The main recommendations, which appear in Section I(B) of the McNamara-Taylor report, were that a phased withdrawal be completed by the end of 1965 and that the “Defense Department should announce in the very near future presently prepared plans to withdraw 1,000 out of 17,000 U.S. military personnel stationed in Vietnam by the end of 1963.” At Kennedy’s instruction, Press Secretary Pierre Salinger made a public announcement that evening of McNamara’s recommended timetable for withdrawal.

https://en.wikipedia.org/wiki/National_Security_Action_Memorandum_263

National Security Action Memorandum Number 263 (NSAM-263) was a national security directive approved on 11 October 1963 by United States President John F. Kennedy. The NSAM approved recommendations by Secretary of Defense Robert McNamara and Chairman of the Joint Chiefs of Staff General Maxwell Taylor. McNamara and Taylor's recommendations included an appraisal that "great progress" was being made in the Vietnam War against Viet Cong insurgents, that 1,000 military personnel could be withdrawn from South Vietnam by the end of 1963, and that a "major part of the U.S. military task can be completed by the end of 1965." 

https://historynewsnetwork.org/article/3446

White House taped conversations and other documents reveal a president who recognized the inherent dangers of military intervention in Vietnam and who had devised an exit strategy. Had it not been for his assassination, the withdrawal plan might have prevented the deaths of more than 58,000 Americans and countless numbers of Vietnamese, Laotians, and Cambodians.