Task: Question Understanding
Input (English): Context : 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. 
Question : What army did JW GROM serve in?
Output (English): military branch