During World War II, Admiral Ernest J. King is alleged to have said, "I don't know what the hell this logistics is that Marshall is always talking about, but I want some of it." It's pretty well known that before that war ended, everyone knew in general terms what it was the General Marshall was talking about and that Admiral King had plenty of it. Knowing in general terms what logistics means is not enough. The purpose of this monograph is to relate in specific terms what logisticians did and how they did it in supporting combat forces in Vietnam. Not only were American soldiers supported, but at the height of hostilities, in addition to U.S. Forces, the U.S. Army in Vietnam also provided support to the military forces of the government of South Vietnam, Republic of Korea, Thailand, Australia, New Zealand, and other allied countries.