now application for deferment is thru online at www.ns.sg liao.
go there and see from the drop down box, there lists most of the
standard reasons for deferment.
if u r called up for >40 days per work year, then still at
least got some basis. since more than 40 days, the employer must
sign a 'release from work' form, apart from acknowledging the
saf100.