The "Materialy" Book Number 9, History of the Polish Parachute Badge by Kpt Jan Lorys, published by The Polish Institute and General Sikorski Museum in London in 1993.
List's the following Information on Parachute Badge Nr:0306.
Entry Nr:1,143: DROZD JOZEF 0306 KPR.LOT.O.VI.CC
O.VI = ODDZIAL VI = SPECIAL SECTION C-IN-C, GENERAL STAFF.
CC = CICHOCIEMNY PRZESZKOLONY i ZAPRZYSIEZONY = "THE SILENT AND UNSEEN" TRAINED AND UNDER OATH.
I hope that this helps a bit.