http://www.cmp-cpm.forces.gc.ca/dhr-ddhr/chc-tdh/chart-tableau-eng.asp?ref=SSM said:
Special Service Medal (SSM)
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NATO service since 2004:
An aggregate of 180 days of honourable service performed in approved locations or tasks outside Canada from 20 October 2004 as part, or in direct support, of NATO operations or mission provided the service in question is not recognized by another medal. Eligibility is limited to the following list: ...
■Service of Canadian personnel participating in the NATO-Iceland Air Policing Program (IAP) since 27 Mar 11 (OP IGNITION);