If you got through to the interviews then your personal statement wouldnt be the problem. Sounds more like you just dont interview well (which is understandable if you are young)
In Russia, I hear bribing your way out is easy going. You can fabricate an entire medical history. Singapore is trickier.
Alternatively, people can chuck their old nationality or 'dodge the draft' and not 'go home' for a number of years until no one cares etc.
In general, military service, bad idea.
The opportunity cost of military service is high. Too high.
Singapore is not going to get invaded or attacked anytime soon. Nor is a part-time, part-trained and casualised bunch of conscripted youth going to stop them.
Or the older, "didn't really like it" conscrips who are older.
Society derives a lot more value out of medics, engineers, academics etc actually doing those things for two more years.
If people want to do military service, make it voluntary and get yourself a professional military. Society deriving 'cheap labour by force' by blunt misallocation is traditionally not really society deriving very much.
Singapore versus China/Australia would be a rather one sided conflict. As would bringing in say India or Pakistan to the mix. Or Russia (if you consider that in the sphere). In fact, you could argue the USA ought to be added in there too. All of whom I would venture could kick Singapore into touch should full scale conflict arise. Especially since most of that list could take you out with the press of a button. In fact, such is Singapore's size, most nations with some purchased 'push-a-button-whizz boom' kit could paralyse the place very quickly. Power generation and in particular, water. If Malaysia stopped supplying you with water, you'd be stuffed, however much you repurify the stuff.
If you are interested, you'll discover that millitary conflict has an over 80% correlation with spending on military budgets for the previous years.
I'd argue the economy isn't first class. In fact, pretty far from it. I've been to Singapore for more than a couple days (ie. too long). Economies are there to produce things which get consumed and in Singapore, people don't do a whole lot of that. You can gear your economy so that it produces endless capital goods to the point where you have the highest GDP per capita by a country mile but it doesn't make life a whole lot of fun.
OECD = Australia, Austria, Belgium, Canada, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Japan, Korea (South), Luxembourg, Mexico, Netherlands, New Zealand, Norway, Poland, Portugal, Slovak Republic, Spain, Sweden, Switzerland, Turkey, UK and USA.
NB, all EU national members are automatically in the OECD.
"Neighbours" Cambodia, Indonesia, Malaysia.
None of whom would be stupid enough to attack or invade Singapore whether it had a sizeable military or not. Stuff like FPDA is exactly why Singapore doesn't need military service. You can depend on someone else.
Political stability under what is largely considered a undemocratic and at least, authoritative
regime government isn't quite the same thing.
Singapore isn't by any means a third rate economy but isn't first class either.
(My own view of Singapore is that it is dull as something very dull. If I wrote a thesaurus, Singapore, boring and dull would be under the same category. It is a place where fun went to die and where old people probably would go to do just that in a mundane and sterile final few years)
An amateur conscript 'military' will ward off no one making a serious attempt 'on your national security'. It is barely a consideration. A big bunch of greens will do little.
The moment political authorities start using the military as a means of maintaining power, ie. by fear of force, you know something has gone tragically wrong in the government process.
Singapore's military, when compared to the region, is by no means ameteur. With 3G transformations taking place on a daily basis and the army embracing technology rapidly in favour of manpower-intensive mechanisms, we're off to a great start in this new paradigm of military power.
In case I wasn't clear, I was referring to external threats. This obviously takes place today. Other governments will shape their foreign policy on Singapore based on a plethora of factors, and you can be sure that a credible military force will make them think twice before pulling a quick one on us.