I Field Force Vietnam (US Army) I Field Force Vietnam (I FFV) was a United States Army field force active during the Vietnam War from 1967 to 1972. The organization was primarily responsible for the coordination and execution of military operations in III Corps, which encompassed the central highlands region of South Vietnam. I Field Force Vietnam was composed of multiple infantry divisions, artillery units, aviation assets, and support elements. The force played a significant role in strategic and tactical decisions during the war’s latter stages, including the 1968 Tet Offensive and the 1972 Easter Offensive. I Field Force Vietnam was a key component of the overall US strategy in Vietnam, aiming to secure and maintain control over critical regions amidst complex and challenging conditions.