One of the heaviest actions of the Vietnam War involving Australian and Viet Cong forces occurred on 18 August 1966. The engagement began when part of the 1st Australian Task Force (D Company) encountered the Viet Cong and local forces in a rubber plantation, near the village of Long Tan. The coin’s reverse depicts an Australian soldier wearing Vietnam War jungle kit. The background incorporates a printed historical image of soldiers at Long Tan, and the inscription LONG TAN 1966. The Perth Mint's ‘P’ mintmark is also incorporated into the design.