Hi GD
BTF usually appears when you are at sea after requesting BCW.
It is not compulsory to do BTF but the tonnage total is useful and you will get additional promotion ability points.
There is no need to return to base.
Returning to base will always advance the date when the mission starts.
Refitting in Helgoland does not.
You can return to the BCW mission at anytime.
You will also notice shortly 3 missions will appear on your map any of which you can request as many times as they exist.
Peter
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