User blog comment:KATANAGOD/Black Ops 2 Logo and Trailer Release Date Leaked/@comment-4020995-20120414135025/@comment-1263839-20120415140448

Black Ops is not just set in 1963. It is set (mp and campaign wise) between 1960/1-1980's. So while some weapons are still out of date, some weapons like the G11 were in production or prototypes in the 60-80's.

The possibilities for Moon is that you would still have to wear a space suit when you return to Earth, as blowing a hole in it probably either made it warm up a hell of a lot or destroyed the atmosphere i.e no or little oxygen.