The Viet Cong believe that an efficient, centrally managed organization is a major tool of revolutionary war. Their organization is complex, but it has been effective. In this study the decision-making and behavior of the Viet Cong main and local force units operating in one Delta province, Dinh Tuong are analyzed. The period is 1964-1966. Using captured documents and interviews with ralliers, defectors, and prisoners, a portrait of how units make and execute tactical decisions and of how they supply themselves are described.