Foreign males cannot sign on or go NS to become citizen except
malaysian. Only PR status born here or one of the parents a citizen
must serve NS, and citizen also not guarantee.
Thats why a lot of PR of the above status live in malaysian have to
come back singapore serve NS. So it is no surprised that there are
a lot of singaporeans living and working in malaysia, and marry
there and their children will still have to come back and serve NS.
Except for those born in malaysia and can get citizenship thru
connections, if not they can be stateless in malaysia if born
there.
But foreigns who are professional can become citizens if they and
their families are worthy to this country, after maybe staying here
more than ten years.