Since we don't appear to be on the same page regarding what that wording implies/means, how exactly do you envision this system working in greater detail?
Edit: Incidentally, you don't need any form of conscription to get enough warriors. Your military is part of the priesthood and being part of the priesthood is basically the most prestigious position in Arthwydish society. You have access to enough volunteers that the Catclaws and Cateyes get to pick the cream of the crop when it comes to their recruits.
Essentially, I think Arthwyd culture leans a lot closer to the belief that a person is considered more the product of the environment that raised him/her when compared to modern western civilization(which is a lot more individualistic).
Given the general inclination central planning and communal action, I'd assume the expectation of events which require soldiers would logically lead to more children being raised to desire military service similar to how one might divert more hands towards the planting of additional crops or the catching of fish if there's a reasonable expectation of food supplies running low in the future.
On the other end of things, I'd expect the communal nature of Arthwyd society to mean that individuals who are raised to become warriors would face a lot more social pressure to conform to society's expectations and become a warrior. With those who face said pressure being very likely to cave anyway because the Arthwyd are very much about putting the community's needs over one's own selfish desires.
Now, if you are groomed for a job since before you were able to formulate your own opinions, if your society's moral values compels you towards it and if both the local authorities and your social circles are pressuring you into the job to the point where the government can reliably predict ahead of time that you will enlist based on the previous factors, can said enlistment still be considered voluntary?
Anyway, I figured multiple generations that overemphasise sending masses of soldiers to fight wars on the Empire's furthest fringe(while waging a civil war in the inner territories along a major artery connecting the capital to the outer territories) might lead to innovations that aim to ensure there's enough recruits.
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With regards to having enough volunteers, I had thought that the priesthood and the military were
mutually exclusive career paths, even if both have a somewhat overlapping talent pool. I took this to mean that having more priests meant a smaller pool of potential warrior recruits. And that our large Mystic pool was indicative of us having a lot of (civilian) priests. I also expected that those who might've been eligible to become Sacred Warriors usually opted to become priests due to the general peace-loving nature of our civ.
Good to hear there's enough volunteers anyway.