I think it long used to be that needed an "A" for night jumps, but "C" for night RW, unlike just a "B" during the day.
Section 3.19 on Group Freefall says "C" for night RW. (In the new 2012 PIM 1)
But in the section on CoP privileges, for the "B" CoP it says:
The holder of a Class B Certificate of Proficiency may
- Group night jumps, once briefed and signed off by an
So is it still a "C", or did the rules change to a "B"?
I've emailed the CWC to point out the discrepancy.