For those confused, guards are classified by skill and not school or unit size. Lets use the SRA and IRA classes as an example. SRA (Scholastic Regional A), and IRA (Independent Regional A), are guards that compete at a similar level of skill but dont compete against each other. All ¨I¨ guards are independently run, and all ¨S¨ guards are run through a school. This is the same for all the classes, SA and IA, SO and IO. There are other classes as well but hope this helps with the general understanding of classification.