Border Protection Forces
Border Protection Forces (Polish: Wojska Ochrony Pogranicza, WOP), also known under its English abbreviation BPT, was the border guard service of the Polish People's Republic from 1945 to 1989. During its 46 years of existence, it repeatedly changed its structural and service subordination, passing from the Ministry of National Defense through the Ministry of Public Security to the Ministry of the Interior, and vice versa, to remain under the Ministry of Interior since 1972.