Oh yes you can. Anyone can renounce their citizenship at any
Singapore embassy overseas (by walking in and filling up a form. it
takes mere minutes). I've asked around and it doesn't matter if
they have REGISTERED for NS (it's another form to fill up).
Registration happens at 16 to 16 1/2 years. Still, it's a grey and
secretive area, I might be wrong, so move quickly and renounce your
citizenship.
Singapore does not recognise dual citizenship (though it does
not and cannot stop you from holding it), so you cannot hold on to
your Singapore citizenship while avoiding NS.
A citizen who does not serve NS is a defaulter, you don't want
to be one.
Waivers- don't exist. You're probably in for PES B or C. In my
experience these are combat vocations, in practical terms virtually
the same as every fighting soldier. You'll be required to carry an
inhaler at all times. By freak of chance you may be vocated as a
clerk. Or you may be vocated a combat soldier, who is used at the
unit's discretion as a clerk if and when it has surplus of fighting
soldiers.
Alize is right. Singapore does not recognise dual citizenship.
TS, got to choose one.You have to find it out at Singapore
embassy.
He has "exercise induced" asthma. He was diagnosed even when he
was not doing heavy physical training. This means that he will be
either Pes C or E. Clerk mostly likely as you are sensitive to dust
and etc.