The is the Japanese Ground Self-Defense Force's counter-terrorist unit established by the former Japanese Defense Agency to counter terrorist activities and deter guerrilla-style attacks on Japanese soil and to conduct military operations, like the 1st Airborne Brigade, against guerrillas or enemy commandos. The unit is based in Narashino, Chiba garrison in Funabashi, Chiba with the 1st Airborne Brigade. The unit was formerly known as the Special Operations Group. The civilian counterpart of the SOG is the Japanese National Police Agency's Special Assault Team.