Vietnam Zippo factory engraved on the front with a depiction of an M113 armored personnel carrier and the text «HHT 3/11th ACR Vietnam 66–67», representing the Headquarters and Headquarters Troop, 3rd Squadron, 11th Armored Cavalry Regiment during its service in the Vietnam War.
The 11th Armored Cavalry Regiment, known as the «Blackhorse Regiment», carried out armored reconnaissance and security missions in Vietnam, delivering mobile firepower, screening friendly forces, and providing rapid reaction support to U.S. and South Vietnamese operations.
