Captain's Office

The Captain's Office is a section of the camp in, and can be reached via the Mess Hall. It costs $500 to unlock. The HK417 can be found and bought here. There is no Barricade sections in this room, although there is a hole in the floor (top-right corner of the room) from which Zombies will emerge.

Tips
Upon unlocking this room, a lone Choker (which may have been the Captain himself) will come out. If you have the L115A1, it will kill it in about four shots. Alternatively, the AK-47 will kill it fairly quickly.