They actually have your nationality on the front of your staff pass along with your name so that ppl no where u are in the "ranking system" along wif ur bar.
SQ is actually run more like a militiary organization rather than a commercial organization. This not only applies to inside the flight deck but permeates to every corner of the company. To understand SQ, you have to get to know Singapore as a country as both of them operate in the same way.