The G550 for Singapore Technologies/Aerospace/Pacific Flight Services MAY or MAY NOT not have been delivered yet. If/when it comes it will be utilized as a trainer for the AEW Gulfstreams the SAF is getting to replace the E-2C's.
PFS currently operates a Lerjet 35 and 45 for passenger charter, air ambulance and mil contract (mostly target tow). The 35/45 are overall white with red striping and the ST logo on the vertical tail.
C2j