Proper sources, what appointment holder or what, on the Internet you can be a supermodel, Superman or a beggar I also don't know whether it's true or not.
As far as I'm concerned, you haven't provided any concrete proof. Until you can, then I have the right to dispute this!
Ok, here's the link.
http://www.mindef.gov.sg/imindef/publications/cyberpioneer/features/2006/feb06_cs.html
• Allowances
NSmen who are key command and staff appointment holders can expect additional allowances on top of their service and make up pay.
This is to recognise appointment holders like Brigade and Battalion Commanders, Regimental Sergeant Majors, Officers Commanding and Company Sergeant Majors, for shouldering greater responsibilities as the SAF transforms into a 3G force.
• Tax relief
Currently all NSmen are eligible for a tax relief of $1,500. Those who performed NS activities in the preceding calendar year get a higher quantum of $3,000. Parents and spouses of NSmen have a tax relief of $750. RECORD IV is recommending that NS key command and staff appointment holders get an additional tax relief quantum of $2,000.