From Halopedia, the Halo wiki
UNSC Buteo's Talon is a ship in service with the United Nations Space Command. On October 31, 2556, Buteo's Talon was docked with the Aranuka Space Tether high in orbit above the Pacific Ocean on Earth. General R. Dellert of the UNSC Air Force was aboard the vessel at this time, where he transferred a classified message to Fleet Admiral Terrence Hood regarding the Office of Naval Intelligence infringing the Treaty of 2552.
Buteo is a genus of medium to fairly large, wide-ranging birds of prey with robust bodies and broad wings.