The majority of NSFs serve in the SAF, as part of the Army.
A 2-month reduction in full-time National Service is given for pre-enlistees who are able to pass their National Physical Fitness Award (NAPFA).
When an NSF completes his full-time service, he is considered to be "operationally ready", and is thereafter known as an Operationally-Ready National Serviceman (NSman).
Lately, national policies are progressively tightened to close up any loopholes that are exploited by draft evaders.
There is a voluntary early enlist scheme by the Central Manpower Base (CMPB) for pre-enlistees who opt for early enlistment, with the consent of their parents, to begin their full-time national service at the earliest age of 16 years and six months.
In the past, the duration of the conscription for a typical Singaporean male spanned over a period of either 2 or 2 years and six months depending on his educational qualifications.
In 2004, the duration was reduced to 2 years, driven by the technological transformation into the 3rd Generation SAF and the surge in NS intake for the next 10 years.In common parlance, the term "Reservist" is used, a vestige of the older nomenclature preceding the current terminology.NSmen are the equivalent of other countries' reservists. They form the backbone of the SAF as NSmen represent the collective will of the nation to stand up for itself and to ensure the security of the nation.Moreover, as compared to the Army, the Air Force (RSAF) and Navy (RSN) are smaller armed services composed primarily of regular servicemen.As the RSAF and RSN's manpower tend to be more specialized, the constant periodic turnover of NSFs is considered to be very disruptive.Pre-enlistees who ran afoul with the law and sentenced to Changi Prison are never released back into Singapore Armed Forces.