The signature is "Grupa na sali w lutym 1931 w Rawie Ruskiej" (Group in the class in february of 1931 in Rawa Ruska). All soldiers are the Reserve Ensign School (Szkoła Podchorążych Rezerwy), the emblems which they are wearing on their collars are SPR emblems - which were allowed only during the education/course for further rank of cadet. Im sure that those seen on photography can't be "Szkola Podoficerska".
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