"GROM (In Polish: sometimes translated Grupa Reagowania Operacyjno-Manewrowego (Operational Mobile Reaction Group); the acronym itself means "thunderbolt") is one of five special forces units of the Polish Armed Forces. It was officially activated on July 8, 1990. It can be and is deployed in a variety of special operations and unconventional warfare roles, including anti-terrorist actions and projection of power behind enemy lines."

http://en.wikipedia.org/wiki/GROM [en.wikipedia.org]