Source: http://en.wikipedia.org/wiki/National_service_in_Singapore
Second Generation Permanent Residents, are mandated by law to
register for enlistment to the compulsory full-time national
service and later, reservist duties when they turn
operationally-ready (ORD).
Minister for Defence Dr Ng Eng Hen stated in Parliament that
between 2006 to 2011, about 8,800 males who had become permanent
residents under the sponsorship of their parents were enlisted for
and served National Service (NS). On the other hand, 4,200 males
who had become permanent residents under the sponsorship of their
parents renounced their PR status prior to serving national
service. Their failure to serve NS will be taken
into account to have adverse impact when they subsequently apply to
study/ work/ visit/ travel in Singapore. These ex-PRs were sternly
warned about the dire consequences of their actions at the point of
renunciation.
After completing mandatory full-time national service, they can
qualify to apply for the accelerated Singapore citizenship scheme.
However, citizenship is not guaranteed for all applicants, as there
are certain criteria that must be met such as educational
qualification, income qualification and NS work performance/
conduct appraisal in the NS Certificate of Service issued upon ORD.
From 2006 to 2010, about 2% of 3,000 Second Generation Permanent
Residents who completed full-time national service and applied for
Singapore citizenship were rejected.
In the Singapore Parliament on 5 August 2014, the Defence
Minister stated that according to records, no such persons have
been granted reinstatement of PR or citizenship. He added that the
policy has been progressively tightened recently such that no
NS-liable PR who renounced his PR status in the last decade has
been granted approval for work or study. For former PRs who fail to
serve NS, any immediate or future applications for renewal of their
parents' and immediate family members' Re-Entry Permits may be
adversely affected, including curtailment of the Re-Entry
Permit.
If the person is not granted Singapore citizenship but still
holds Singapore permanent residency, he is still obliged by law to
serve the national service obligations, i.e. operationally-ready
reservist duties/ in-camp trainings.
Singapore Permanent Residents who served national service but
did not acquire Singapore citizenship will be treated equally to
those permanent residents without service obligation; they would
not have access to the privileges granted to Singapore
citizens.