During the Vietnam War, the U.S. Army Corps of Engineers played a pivotal yet often underrecognized role in supporting military operations and infrastructure development. The 18th Engineer Brigade, reactivated in July 1965, was central to these efforts. Deploying to South Vietnam in September 1965, the brigade was tasked with overseeing Army engineering operations until the establishment of the U.S. Army Engineer Command, Vietnam, in late 1966.