User blog comment:Zombie pls/SAS4 snow mission/@comment-3224196-20141125221712

As I'm a data stalker, I actually noticed the mission as soon as the Apocalypse update came out, and that was when it was first added to the code (if you must, check the edit log for my profile page). And yeah, from what it seems to be, there appears to be dialogue that refers to defending the facility or a section of it.