4/30 Update: Leonard Reiffel
In the BO3 "Only the Cursed Survive" poster, there is a cityscape at the bottom which has been revealed to be Chicago (thanks to @PINNAZ )
It got me to researching Chicago, and it's notable citizens whom could possibly relate to the zombies storyline. There was an individual by the name of Leonard Reiffel, and the man has collaborated with members of Operation Paperclip.
Specifically (borrowing from wiki), "Reiffel collaborated with German scientists recruited in America as part of Operation Paperclip, working on an early prototype for a railgun."
At the University of Chicago's Institute for Nuclear Studies, Reiffel helped construct a Cyclotron (high energy beam, particle accelerator).
Imagine how shocked I was to learn that Leonard Reiffel led Project A119 - the plan to detonate a nuclear warhead on the moon. (more information on Project A119 Below)
Reiffel also was a consultant to NASA on the Apollo program about the chance of there being life on the Moon (he later became deputy director of the "life on the moon" project).
Will Chicago have any significance, other then a location? Hard to say. If we're able to time travel, anythings possible - even going through with Project A119 (whatever that would achieve). Regardless, Reiffel's connection the Moon, and the nazis is interesting.
Just food for thought, really.
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Also, I've found the full document for Project A119:
http://nsarchive.gwu.edu/NSAEBB/NSAEBB479/docs/EBB-Moon02.pdf
Happy reading!