Whilst looking at the photos from the thread Aircraft ID Assistance by Musec I came across this photo
https://picclick.de/Foto-Flieger-Off...use-Frankreich
I hope this is the right link but I am hopeless with technology so if not possibly one of the more able could post a better link.
As well as a number of pilots the photo seems to include an unusually marked Fokker EIV and two biplanes I do not recognize.
The photo is captioned Sivry sur Maas but is this Meuse and if so is this the fighter unit established by Boelke although he does not seem to be in the picture but does anyone recognize the men in the picture