The Military Counterintelligence Service (MCS) (Polish: Służba Kontrwywiadu Wojskowego) is one of the principal intelligence agencies of Poland. It is responsible for the protection of Poland against internal threats and for the combat capability of the Polish Armed Forces. MCS was established under the Act of June 9, 2006 and is subordinate to the Ministry of National Defence. It was founded on October 1, 2006, the day before the Military Information Services was dissolved.