He was surely an officer... He has the Military - Jubilee cross 1908, but no Jubilee medal 1898, so that means his military career could start after 1898. He has Silver, so as Bronze Military Merit Medal, but no MVK (Military Merit Cross) - maybe because of his injury he could not "go back" to front line. For an "Oberstleutnant" he has quite inconsiderable decorations. No MVK, no EKO, no FJO, nothing. I think he could "finish" the war with the rank of leutnant/oberleutnant and was promoted after the war...