You guys are too quick to assume that Treyarch is staying in chronological order with Black Ops. Yes, all the WAW ones were, and Kino, but Five seems irelavant to most. But it probibly isnt. Maybe, after Kino, they go somewhere else like a German testing facility (Discovery?) where they learn of the 115 station on the moon. So Richtofen devises that they mustgo to the lunar station to escaoe the zombies and bring the world leaders (who hired them) with them, and after the the zombie attack at the Pentagon (Five) They go save them.
Think out side the box and get a little Lost with it. Zombies isnt about facts, its about speculation and creativity. They will never give us all the answers.