The Imperial Guard is the official military and police force of the New Shi'ar Imperium. Technically, both Shi'ar and non-Shi'ar can serve-and do- as members of the Imeperial Guard, although the upper ranks ate mostly composed of Shi'ar officers. Most non-Shi'ar members of the Guard are Humans.
The Guard is divided into the following branches:
Ork Auxiliaries (technically part of the Imperial Guard but in practice Orks temporarily hired by the Imperium as mercenaries)