Yeah I don't think anyone would get two based on one rotation (yes the clerk told me that too, I sent her this ref, but I think I just confused things), but if you went over flew 30 and came back then redeployed you would be eligible for the GSM based on this reference..
" CANFORGEN 072/10
Para F. WITH THE NEW PRINCIPLE OF ROTATION RECOGNITION, THE EXISTING PROVISION STATING THAT ONE CANNOT EARN BOTH THE GCS AND GSM IN RESPECT OF THE SAME OP IS AMENDED SO THAT IT IS NOW POSSIBLE FOR A PERSON TO EARN AND WEAR BOTH THE GCS AND THE GSM FOR A GIVEN THEATRE AS LONG AS THE PERSON DOES NOT MEET THE CRITERIA FOR BOTH DURING THE SAME 6 MONTHS PERIOD. WHEN A PERSON MEETS THE CRITERIA FOR THE GCS-SWA OR A BAR TO IT AND THE GSM-SWA OR A BAR TO IT WITHIN A PERIOD OF 180 DAYS, THE PERSON SHALL ONLY BE AWARDED THE GCS OR A BAR TO IT "
I think it would be worth looking into, I know the flavour of the day is "NO". I know I would be looking into it, but I am handcuffed to my desk and can't get back over [
I know people will read this para and say "but that only applies to the SWA..", when clearly it is an example.