What should replace the question mark on this list?
JBNRS, HF, GM, JPD, VL, AELMP, MS, WB, CB, GS, EC, SV, PD, PEJP, ?, …
Hint, added later:
There's a hint alluded to via wordplay in the post title.
Hint, added even later:
Although I list JBNRS first, there was, some five or six years earlier, PHCS. But PHCS doesn't really count.