I can't be positive but as I remember the French example had US cocardes removed (none in this picture); these designators were also on USAS LUSAC.11s (mostly this style) but with some variations.........
SC.42138 at McCook was marked
"L
USA
C.11
P
54
S.C.
42138"
---------- 40015 was marked-
"USA
C.11
40015
P
53"
Both had US rudder stripes and both S.C. and A.S. prefixes were used though "Air Service" had been authorised on 24 May 1918. A LUSAC at the Packard car plant in Detroit with a mock-up of a Bugatti engine had similar tail markings to Clint's original photo.
These are the 3 fields at the Orly base; I may be mistaken about the location but there are photos showing a similar line of trees though they would no doubt be very common.
Nick
https://en.wikipedia.org/wiki/Orly_A...field_Maps.jpg