Final answer:
The most important and prestigious specialized troops were the Auxiliaries. The legions were made up of Roman citizens, but not all members of the Roman military were citizens. They served as scouts and support for the legions.
Step-by-step explanation:
The most important and prestigious specialized troops were the Auxiliaries.
The legions were made up of Roman citizens, but not all members of the Roman military were citizens. Instead, there were auxiliaries: Roman subjects who served the empire alongside the legions. The auxiliaries were divided into cohorts of infantry and alae of cavalry. They served as scouts and support for the legions.
The Praetorian Guard, on the other hand, was a key legion that stood apart from the rest of the military. Their main job was defending the emperor himself and the city of Rome. They were recruited from veteran legionaries and had attractive terms of service.