Loading Screen :
http://images2.wikia.nocookie.net/__cb2 ... oading.jpg
As you can see in the loading screen, there is a trio of very large rockets in one of the pictures. From what we can see, the shadows spell 115.
Now, if any of you guys know stuff about rockets, you would know that those aren't your pick of mill Soyuz launch vehicles. Judging from the size, I'd say that they rival the Saturn V, which would lead me to believe that they are russian N-1 rockets, which were designed for moon ops.
Though these rockets never managed to get to the moon(engine failure of sorts), during their design process it was suggested to use a thermonuclear engine for the upper stages. The thermonuclear engine would obviously have a nuclear reactor on it, this type of engine is effective for deep space travel.
Since this is a fictional story, setting, and everything. The 115 shadows would make me think that element 115 powered the upper stages of the rockets in that picture.
Why 115? if any of you have been unfortunate enough to watch an episode of "UFO Hunters" on the history channel, you might know that in all of the UFO conspiracies element 115 is used as the source of propulsion for all these UFOs.
The N-1 rockets, which were supposed to go to the moon, could have actually managed the trip in Zombies, but why would they go to the moon you ask? according to that computer terminal in the main menu, there is proof that element 115 exists on the moon, element 115 is closely sought after by both super powers for it's applications in weapons, propulsion, and teleportation technology
So in turn, the russian rockets could have
1. brought quantaties(sorry if that is spelt wrong) of element 115 back to Earth for study
2. or established a teleporter on the moon to be used as a portal for ferrying materials to build a moonbase and study the element
questions? comments? discuss please :)