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JW GROM (Full Name: Jednostka Wojskowa GROM im. Cichociemnych Spadochroniarzy Armii Krajowej; English: "Military Unit GROM named in honour of the Silent Unseen of the Home Army") is Poland's elite counter-terrorism unit. GROM, which stands for Grupa Reagowania Operacyjno-Manewrowego (English: Group (for) Operational Maneuvering Response), which 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 operations and projection of force behind enemy lines.
JW GROM was officially activated in 1990, but the elusive unit only went public in 1994. Their namesake is derived from the legendary WWII Silent Unseen. Specialists in unconventional warfare roles, they are famous for leading anti-terrorist operations deep behind enemy lines.