User blog comment:AndImBatman/A theory: New Black Ops II Zombies Storyline/@comment-200.104.118.230-20130112232920/@comment-1263839-20130114152642

Nuketown takes place at the same time as Moon, which is set somewhere near the present or the near future because of CotD.

And Treyarch's not been known to use weapons from the timeframe the action is set in.