Thermon, the Aitolian capital, would have an Aitolian army. In general, thureos-armed infantry and aspis-wielding cavalry is a good start. The Aitolians were never a people to field great numbers of traditional hoplitai as the core of their armies, so include peltastai, thureophoroi, and thorakitai as an important part of the army. By the middle to later third century, most of the Greek states had moved in that direction as well. On the other hand, several states experimented with phalangitai, including the Spartans, Boiotians, and Achaians. And many still had hoplitai of some sort or another in their armies, though for quite a few people the hoplitai largely disappeared, folded into units carrying the thureos rather than the aspis.