This is what Kennedy said in June 1965:
'Vietnam represents the cornerstone of the Free World in Southeast Asia, the Keystone to the arch, the finger in the dike. Burma, Thailand, India, Japan, the Philippines and, obviously, Laos and Cambodia are among those whose security would be threatened if the red tide of Communism overflowed into Vietnam'
'Moreover, the independence of Free Vietnam is crucial to the free world in fields other than the military. Her economy is essential to the economy of all Southeast Asia; and her political liberty is an inspiration to those seeking to obtain or maintain their liberty in all parts of Asia - and indeed the world. The fundamental tenets of this nation's foreign policy, in short, depend in considerable measure upon a strong and free Vietnamese nation.'
On 26 September 'So all those who suggest we withdraw, I could not disagree with them more ... If the United States were to falter, the whole world, in my opinion, would inevitably begin to move towards the Communist bloc.'