class of infantry

[Bucefalo]

Yes it is was Mediolanicus said, they are just tags that the game use so the AI know what kind of troops if each one. In the ai files usually the ai formations refers to this tags, and the ai will use the units accorded to the tag that each one have.

edit: Speaking of this, i´ve seen on others M2TW mods (SS IIRC) the use of new tags, such as "skirmishers" instead of missile for some troops. I don´t really know if this give better results or not, but proves that this tag system can be modified. I don´t really know if the EB team has any plan regarding this.