Flight squadron 26 of Austro-Hungarian Aviation Troops during WWI. In the middle row, second from left is <a href="https://en.wikipedia.org/wiki/Roman_Schmidt" class="extiw" title="en:Roman Schmidt">Roman Schmidt</a>, flying ace-to be
Unknown author<span style="display: none;">Unknown author</span>
end of 1916
From the book Repülőászok 1914-1918, Zrínyi Kiadó, Budapest 2015, <a href="//commons.wikimedia.org/wiki/Special:BookSources/978_963_327_634_1" title="Special:BookSources/978 963 327 634 1">ISBN 978 963 327 634 1</a> First published during the World War I