Boone is part of a coalition of international forces from Australia, New Zealand and Canada.
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Sub Unit One provided naval gunfire and close air in support of South Vietnamese Army and Marine units, South Korean Army and Marine units, Australian and New Zealand Armed Forces as well as United States Army and Marine combat Divisions.
The boonie hat was introduced to the United States Armed Forces during the Vietnam War, when U.S. Army Green Berets began wearing them in the field, along with Australian and Army of the Republic of Vietnam units.