Hi Bon, it's a public service medal. Those are conferred by the president during national day. During national day period, the papers will publish a long list of names.. some of them are BBMs, PBMs, then still got Star and Award..
I doi'nt know the difference.
But if your JP has a PBM or something like taht, it means the JP has made some contribution to society, Your ROM cert will show your JP having PBm cos pple with PBMs awarded, can use the title PBM behind their names.