Disfigured moon???

The use of the moon, is the soldiers of minas morgul token because Minas Ithil is the tower of the moon... the light of the city was tainted and warped, thus the corrupted moon. It's a reminder to the enemies of mordor that it was once fair; very simple and effective. As for it being the witch king's emblem... i doubt it. I seem to have read elsewhere he had another token? I wonder what the armies of Dol Guldur had as their token...