Beginning in 1954, the United States Army attempted to build a viable armed force in South Vietnam. Until the early 1960s, other areas commanded more American attention, yet this formative period was influential in later United States involvement in Vietnam. This thesis examines United States advisory efforts from 1955 to 1960 by analyzing the tenure of Lieutenant General Samuel T. Williams as Chief of the Military Assistance Advisory Group in South Vietnam. During Williams's tenure, the communist forces in the north began the guerrilla insurgency in earnest. Williams's failure to respond to this change has been justly criticized; yet his actions were reflective of the United States Army's attitude toward insurgencies in the late 1950s.