Ludvik Fink with fellow soldiers of the Austro-Hungarian army

In the photo you can see my father Ludvik Fink's unit during World War I. I don't know which one of them is my father. The photo was taken during the Austro-Hungarian Monarchy, because that's when my father was in the army. He was in the army for seven years, because in those days basic army service lasted three years, and just when he was supposed to take off his uniform, World War I broke out, and he stayed in for another four years. He spent the entire time in Yugoslavia, in Bosnia and Herzegovina and in Serbia.