Fleet Admiral Sir Terrence Hood is the de facto leader of the UNSC, flag officer of the UNSC Navy and the Commanding Officer of the UNSC Home Fleet.
Admiral Hood (or Lord Hood) is the chairman of the HIGHCOM Security Committee and is the commanding officer of all UNSC Defense Forces in 2552. He commands the planet's defenses, from orbit in ODA-142 Cairo Station.
Fleet Admiral Lord Terrence Hood (voiced by Ron Perlman) first appears in the novel, Halo: First Strike. He is a member of the UNSC Security Committee and is the Chief of Naval Operations. He is said to generally have a commanding and powerful voice. He greatly respects the SPARTANS, not only because of their record, but also because they saved his life on two occasions. When Halo 2 begins Admiral Hood presents the Master Chief, Sergeant Johnson, and Miranda Keyes with medals aboard the Cairo Station. In Halo: Ghosts of Onyx, Hood receives an urgent message by Dr. Halsey requesting for him to send Spartans to assist her, and obliges by ordering Fred-104, Will-043, and Linda-058 to Onyx. In Halo 3, Hood is in overall command of Earth's defense, with Commander Miranda Keyes reporting directly to him. He accepts the need for Humanity to ally with the Elites, but is not entirely happy about it. He leads the remaining human naval forces in an attack on the Prophet of Truth's dreadnought, but the attack fails when the Forerunner artifact under New Mombasa activates, creating a portal to the Ark. When the Master Chief, Keyes, and several Elite and human forces choose to follow the Prophet of Truth through the portal, he decides to stay behind to make a final stand on Earth. At the end of the game, he commemorates a small monument to the war and the sacrifices it had involved.
"Lord Hood", is seen wearing the UNSC Medal of Honor, the Purple Heart, and the Navy and Marine Corps Medal along with a number of other service ribbons and citations.