Originally Posted by Zeruis
It is presumed that a few group members went to the air force base to look for supplies. While there, they found Mark. The only reason he was invited to the group, was that Mark had food and supplies, which the group was lacking. As for the actual gameplay of the air force base, I guess that we will never get to play it.
Like I said, I know they tried to explain it within the confines of the game with convenient dialogue ("The only reason YOU'RE here..." from Lilly, for example). But that seems ridiculously weak. I mean really, even if it had been as simple as him showing up at the beginning all "Oh hey, I've got food at my base, come get it". Or heck, why couldn't HE be the guy we save from the bear trap at the beginning?