The Griffin-class Transport was a class of ship used by the UNSC for stimulation of colonies and eventually as a warship with refits. The ship is able to carry thousands of passengers to established colonies, giving a rapid boost to their population and reducing overpopulation on Earth. By 2500, over one hundred Griffins were active and making a combined average of 400 trips per year. Beginning in 2526, a number of the ships of the class were refitted with missiles and even Magnetic Accelerator Cannons to combat Covenant ships, much like the Phoenix-class Colony Ships. The last active Griffin controlled by the UNSC was destroyed in 2535 in a clash with two Covenant Light Cruisers.