The Ultramarines are, in many ways, the exemplars of the many Chapters of the Space Marines. With a proud and long history of service, they make extensive use of honour markings, including medals, Ultima symbols, laurel wreaths, and tilting shields. The Ultramarines pride themselves on their adherence to the Codex Astartes, written by their Primarch, which details all the unit markings, squad numbers, and honorifics that the Adeptus Astartes use on their armour and vehicles.