Initially, conscripts could not pick and choose their desired or preferred vocations due to manpower constraints and quotas. Since 2016, however, this was changed as, when enlisting, individuals can indicate their preferred vocations. Since 2004, Singapore cut its mandatory military service period of 30 months to between 22 and 24 months, depending on medical health and physical fitness. NSmen make up >80% of its military defense system and form the backbone of the SAF. NSmen represent the collective will of Singapore to stand up for itself and to ensure the security of the nation.