u/clementineremond

Hello everyone! I need your help solving a little mystery.
26 years ago, someone gave my parents a mirror as a wedding gift. Yesterday, the mirror fell and broke, and hidden behind it, we found this photograph.
We have no idea who this man is. The only clues I have are the ones visible in this photograph.
I would love to find out who this man was, what his role was in the French military, and, most importantly, on what occasion this photograph was taken in Paris in 1917.
I’ve done some research myself, but I’m clearly not much of a detective, so I’m counting on you to help me solve this mystery! 😊