The DEW Line or DEWline, also know as the Distant Early Warning Line, was a system of "bases" across Northern Canada.
My father worked on the DEW Line, on the Baffin Island.
From what my father told me, there were both Canadians and Americans at these bases.
My father had a "red phone" with a direct line to the President of the USA while there.
I think alot of the information about the DEW Line has still not been made public.