Mulvihill is a retired Marine staff sergeant working as the safety specialist with 7th Marine Regiment. He is a Vietnam War veteran who earned a silver star during a battle that made him and his company known as the most highly decorated small unit in the history of the military. - Mulvihill is a retired Marine staff sergeant working as the safety specialist with 7th Marine Regiment. He is a Vietnam War veteran who earned a silver star during a battle that made him and his company known as the most highly decorated small unit in the history of the military.