I guess when you have larger armies on either side you go for air power- 300,000 in the Indonesian Army - tho that is a VERY variable quality organisation
The Singapore Navy could probably take on anyone locally as well
But probably they just need someone to flick a switch in an office off Orchard Road and switch off electricity and fry every computer outside Singapore for a couple of thousand kms - they study the Israeli's carefully and I'm sure have similar IT skills.......................