GROM is Poland's elite counter-terrorism unit. GROM, which stands for Grupa Reagowania Operacyjno-Manewrowego, or in English Operational Maneuver Response Group, but also means "thunder", is one of the five special operation forces units of the Polish Armed Forces. It was officially activated on July 13, 1990. It is deployed in a variety of special operations and unconventional warfare roles, including anti-terrorist actions and projection of power behind enemy lines.