Although America provided non-combat advisors to South Vietnam during the Kennedy Administration, some of those advisors were getting killed. Their families were extremely upset. President Kennedy attempted to explain his motives for involvement in Vietnam, but not everyone agreed with the White House and Pentagon decision makers.
Meanwhile ... the war of aggression, by the North against the South, was about to worsen, dramatically. Photos from the National Archives (and other web sites) document some of the events:
By late summer, 1964, the role of America's military had dramatically expanded. No longer were U.S. troops merely giving advice and providing shelter. Events in the Gulf of Tonkin provided the Johnson Administration with a reason to drastically change the course of the war.
For the next 8½ years, Americans would die in Vietnam.