Państwowy Korpus Bezpieczeństwa (Polish for National Security Corps, short PKB, sometimes also referred to as Kadra Bezpieczeństwa) was a Polish underground police force organized by the Armia Krajowa and Government Delegate's Office at Home under German occupation during World War II. It was trained as the core of the future police forces during the assumed all-national uprising and after the liberation. The first commander of the Corps was Lt. Col. Marian Kozielewski. He was later replaced by Stanisław Tabisz. In October 1943 the PKB had 8 400 officers, until early 1944 the number grew to almost 12 000.