i'm not sure if it's a recent change (ns.sg got revamped more than once recently), but this was never a problem for me before... (i'm usually away 11 months out of each year with regular short trips back to singapore)
also something came on my radar a few days ago which i never knew before...Error :
Your request cannot be processed: Sorry, your consolidated overseas trips are 6 months and above, you are therefore required to apply for an Exit Permit for your trip.
i am unsure what happens if you do not have an assigned unit... caveat lector!under the Enlistment Act, an NS man can be charged and convicted in court for failing to notify CMPB after having not received any order or notice from his national service unit for six consecutive months.