User blog comment:Damac1214/Black Ops II - DLC 5 Rumors surface/@comment-10261308-20130620023410/@comment-3123696-20130620221256

"Nuketown isn't storyline related either, as it's a bunch of CDC members/CIA agents who went to investigate the Nuketown bombing, and found zombies. "

It is story related. It happens at the same time as the events of Moon.