If I've not served my National
Service, can I apply?
Yes, you can. SPF will have to check with Central Manpower Base
(CMPB) prior to your appointment for approval to release you from
full-time National Service enlistment.
All male Singaporeans/ Singapore Permanent
Residents who have not completed full-time national service
must serve a minimum term of 5 years (known as Minimum Term
of Engagement, MTE) as a regular officer so as to fulfil your
full-time National Service
obligation.
http://www.spf.gov.sg/career/