Singapore has mandatory national service for citizens and 2nd gen PRs. So many PRs I know or their kids immigrated once the kids were at that age. Not just because they don’t want to serve, but serving in another countries military might get messy.
Not sure they have an incentive to make it easier for PRs.
It may also be illegal to serve national service (NS) in another country. I.e. I believe Turkish nationals are not allowed to serve, so as a PR this can indeed get very messy/illegal, or you may end up doing two different nationa services.
Not sure they have an incentive to make it easier for PRs.