Hey TTG! I was looking around in the new maps and found a room in the map Stockpile with a radio. The room is at the top left corner of D3. Here is the code the radio says.

Echelon 9 8 11 17 1 17 7 18 24 1 0 19 18 5 1 11 15

I'm assuming this has to do with zombies.

I found this on release day, but never got around to posting it.