The 20th anniversary of WG happens to be in the beginning of November, thus they decided that for WoWS they will give us some Halloween themed camos, as well as a neat little sign.
The mission for the camos is daily repeatable! The code has been tested on EU, NA and ASIA.
Finally, the code itself: IYMYSIDJYBJCIBT
Big thanks for phX for bringing this to our attention!