The drawing is of a DH6, but, as Jean-Louis says, the photograph is of a DH5. Apart from the back stagger of the DH5, the DH6 was a much more angular machine, this was to allow ease of production and aid repair -I believe that the top and bottom mainplanes were interchangeable. It was intended as a trainer, although it was also used on anti-submarine patrols, and could be expected to receive plenty of rough handling at the hands of novice pilots.

This aircraft is not an Airco D.H.6 but an Airco D.H.5. Charactéristic of this aircraft is the inverted stagger of the wings.