Caption below image reads "U.S. - 3AC- 1st Aero SQDN-A 133-Salmson Observation Plane in Flight-6/10/19-16th Photo Sec." Image shows a single Salmson 2 airplane in flight with the pilot looking at the photographer.
Caption below image reads "U.S. - 3AC- 1st Aero SQDN-A 129-Salmson Observation Plane in Flight-6/10/19-16th Photo Sec." Image shows a single Salmson 2 airplane in flight with the second seat gun pointing up.