Vietnam era, lot of 24 leaflets were made to be distributed to North Vietnamese soldiers and civilians and dropped by the US Air Force to diminish the morale of the North Vietnamese. Excellent. Between 1960 and 1968 the United States conducted intensive psychological operations (PSYOP) in Vietnam. To date, no comprehensive study of the psychological war there has been conducted. Development of American PSYOP forces and their employment in Vietnam. By looking at the complex interplay of American, North Vietnamese, National Liberation Front (NLF) and South Vietnamese propaganda programs, a deeper understanding of these activities and the larger war emerges. The time period covered is important because it comprises the initial introduction of American PSYOP advisory forces and the transition to active participation in the war. It also allows enough time to determine the long-term effects of both the North Vietnamese/NLF and American/South Vietnamese programs. Ending with the 1968 Tet Offensive is fitting because it marks both a major change in the war and the establishment of the 4th Psychological Operations Group to manage the American PSYOP effort.