Szare Szeregi
The Gray Ranks' structure was based on the prewar structure of the Polish Scouting Association, modified to suit the new circumstances of occupation and repression. The basic unit was the troop ("drużyna"), comprising some 20 boys or girls. Each troop was composed of several squads ("zastępy"), each "zastęp" comprising 7 persons. Several troops from a specified area (city district, village or town) formed a district ("hufiec"), which in turn formed part of a region ("chorągiew" — literally, a banner or standard). During World War II, the several units were referred to by their own code-names: