In this interview Heinz discusses his primary contacts in other government agencies; the Vietnam task force; the different political trips and survey missions to Vietnam; the Maxwell D. Taylor-Walt W. Rostow mission to Vietnam and subsequent report; the Ngo Dinh Diem regime; the rise in interest in the concept of counterinsurgency; problems with working in Vietnam; changing the terrain in Vietnam with the use of defoliants; the Strategic Hamlet program; how to measure success in warfare; the International Control Commission; General Paul D. Harkins; the various agency reports coming out of Vietnam and interagency meetings; the Buddhist crisis in the summer of 1963; the appointment of Henry Cabot Lodge as Ambassador; and the military coup in Saigon and the rumors leading up to it, among other issues.