This book covers the US Marine Corps in the Vietnam War, centring on the structure and function of the two Fleet Marine Force (FMF) divisions and the corps command level, III Marine Amphibious Force (III MAF). This detailed examination of III MAF explores its infantry, armor, artillery, aviation, service and engineer elements. Author Ed Gilbert explains how they functioned and highlights tensions that arose in the command structure as the war progressed. He also illustrates how the two FMF divisions bore the brunt of the fighting in the more conventional war against Viet Cong and North Vietnamese Army units, and the very different role of the four Combined Action Battalions based in Viatnamese Villages.