I only clarify because in a situation where every able body is fighting you’ve already lost, there needs to be logistics, maintaining utilities, growing food, etc

Conscription is actually a way to ensure that. In the Ukrainian War, as well as at least the US during WW2 (I'm less familiar with other countries' conscription systems during WW2), conscription is used to prioritize those with skills which are not economically vital during wartime - during WW2, even, some skilled workers weren't even allowed to volunteer, much less be conscripted, for military service.