I'll have to go back and check if I can remember which book it was in, but I believe that I read that there were some German agents captured in Mexico that were either trying to persuade them to join the nazi's or get permission to position troops there.

Of course there were also German and Russian spies caught in the US so it might be somewhat speculative as to suggest their real motives IMO.

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Mark Manchester
USAF 1989-1993