I've understood that the army gives the not fit for service grade quite easily, because the people who are willing to go that far to avoid service could be seri

I've understood that the army gives the not fit for service grade quite easily, because the people who are willing to go that far to avoid service could be serious trouble if they'd be forced to serve anyway. Back in the day many employers considered missing military service suspicious so serving and doing the bare minimum would be better than trying to avoid it completely.