For the third time in five months, U.S. Defense Secretary Robert S. McNamara was in South Viet Nam to see what shouldor couldbe done about that frustrating, dragging war. This trip was the result of a new and disturbing series of eventsthe second coup in Saigon; De Gaulle's "neutralist" lures; terrorism by the Communist Viet Cong against Americans; the inability so far of South Viet Nam's latest strongman, 36-year-old General Nguyen Khanh, to get the government on the offensive.
The scene that awaited McNamara, therefore, was about as grim as ever. Four more U.S. advisers died during...