WHEN WE LOST VIETNAM

I have written in several places that the real turning point in the war was in 1967. Here's my evidence:

(sorry, no link)

How North Vietnam won the war
Wall Street Journal. (Eastern edition).
New York, N.Y.: Aug 3, 1995. pg. A8
Copyright Dow Jones & Company Inc Aug 3, 1995

(relevant excerpts)

Bui Tin, a former colonel in the North Vietnamese army, answers these questions in the following excerpts from an interview conducted by Stephen Young, a Minnesota attorney and human-rights activist. Bui Tin, who served on the general staff of North Vietnam's army, received the unconditional surrender of South Vietnam on April 30, 1975.

Q: What about Gen. Westmoreland's strategy and tactics caused you concern?

A: In January 1967, after discussions with Le Duan, Gen. Thanh proposed the Tet Offensive. [snip] Only in July was his plan adopted by the leadership. Then Johnson had rejected Westmoreland's request for 200,000 more troops. We realized that America had made its maximum military commitment to the war. Vietnam was not sufficiently important for the United States to call up its reserves. We had stretched American power to a breaking point. When more frustration set in, all the Americans could do would be to withdraw; they had no more troops to send over.