WW1 Pin ID?

Canadian Active Service Force?

http://www.search.com/reference/Cana..._Force_Command

In 1939, the Canadian Active Service Force was mobilized; similar to the CEF, this was a mobilization of prewar PF and NPAM units, who retained their traditional titles. In 1940, the land forces of Canada were retitled. The CASF became the Canadian Army (Overseas), the Permanent Force became the Canadian Army (Active) and the NPAM became the Canadian Army (Reserve). The Canadian Army (Overseas) ceased to exist after the Second World War.