Card sleeves? We don't need no stinkin' card sleeves!
My guess is when you move into the bunker in DDD, you switch to playing AIYP - but starting at the bunker entrance instead of the drop zone.
Yep, that is my guess also.
Try the Vassal of the PnP version if you haven't. It is a nice little game.
I'm all over the Kickstarter, just hope I have the $ for the level I want before the campaign ends.