Task: Question Understanding
Input (English): Context : Józef Haller von Hallenburg (August 13, 1873 -- June 4, 1960) was a Lieutenant General of the Polish Army, a legionary in the Polish Legions, harcmistrz (the highest Scouting instructor rank in Poland), the President of the Polish Scouting and Guiding Association (ZHP), and a political and social activist. 
Question : What military organization did Józef Haller belong to?
Output (English): military branch