Thule's Errand Camouflage is a hidden and unlockable camouflage exclusive to Call of Duty: WWIINazi Zombies found in the map The Shadowed Throne. The camouflage can be unlocked by changing both frequencies on the Soviet radio in the Main Street to 39 (left) and 39 (right). The frequencies came from Drostan Hynd's journal.
"The tools caused any electronics to go haywire when brought near, and our radio would screech unless we tuned it to 38.9, 39.7... after a minute we heard voices. I threw the radio into the sea that night."