One of many D.VII aircraft claimed by the Allies.
Given the uniforms, it is probably American or perhaps British.
It can be a provisional setup.
About 140 aircraft have gone to the US.
At the back of the hull is 109 EN is visable, in small also on the rudder.
That number 109 will likely be the numbering of the D.VIIs for the US.
Inside the shed / hangar you can see a few more where the tight German cross is bordered by a sloppy drop pattern.
On the wing is still just the German cross.
Furthermore, the sloppy white painted sign makes no sense.
The 2 x 3 (oblique) stripes belong to that own designation that German pilots sometimes had.