So, given that my character wants to rejoin the military, I'm here to propose the creation of just such a body.
The army would obviously be a subset of the knights, but one without permanent membership and lower requirements for entry.
The army would no doubt have been created shortly after the Knights, as a way for common folk to learn to defend themselves. A militia of sorts, which then became a permanent fixture of Syliras.
(Proposed history)
The Syliran Army would have a rough history. Being mostly a collection of common folk with a light salting of veterans, they are poorer than the knights and are thus less equipped for war. They suffer harshly during any military action, though their ferocity makes up for their lack of experience.
They are the core of the defensive capabilities of Syliras, and for good reason. Those who fight in the army fight to defend their homes and their families.
Over the centuries since its founding, the army, which started out as little more than a ragtag collection of villagers who were deemed unfit for knighthood, has carved out a place of honor for itself in Syliras.
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I'm guessing most of the engagements the army has fought in have been over resources. Maybe an incursion or two by the Black Sun.. ?