Lead: For 400 years service men and women have fought to carve out and defend freedom and the civilization we know as America. This series on A Moment in Time is devoted to the memory of those warriors, whose devotion gave, in the words of Lincoln at Gettysburg, the last full measure.

Intro.: A Moment in Time with Dan Roberts.

Content: Of all the controversies of the Vietnam War, none has generated as much heat as that surrounding the Gulf of Tonkin Incident of August, 1964. It represented the tipping point of U.S. involvement in Southeast Asia. From that seemingly innocuous dust-up flowed a vast increase in American engagement, ultimately American withdrawal, and, most would say, American defeat.