Dexter Parker, also known as Scotch, was a Spartan 1.1 and later a Orbital Drop Shock Trooper in the UNSC Defense Force. He participated in most of humanity's greatest battles against the Covenant, including the Siege of the Atlas Moons and the Battle of Reach. He then joined the human-sangheili Mandorla Campaign and continued to fight on the frontlines throughout the Rebuild Era.