Colonel, later Rear Admiral, Robert Fazio served in the UNSC Marine Corps during the Human-Covenant War and the UNSC-Brute War. He was killed during the Battle of Thadus IV. He was the older brother of Lt.Com. Nicholas Fazio, the father of John Fazio and Victoria Fazio-Demarco and the grandfather of John Demarco. For much of his career, he was often at ends with Admiral Margaret Parangosky, commander of ONI, and Captain Serin Osman, her protegee.