Kees Kort Comments

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The name COSETTE painted on the front of the fuselage gives away that this is a Caproni used by the French Aviation militaire. As France had no heavy bombers which were judged reliable enough for front service, they turned to the Italians specifically the big Caproni trimotors.
A considerable number of these Caproni Ca.3 bombers were licence built by the R.E.P. (Robert Esnault Pelterie) and licence built machines became known as C.E.P (Caproni Esnault Pelterie) trimotors. Specifically there were in France three different types identified as the C.E.P. 1 B2, C.E.P. B2 and C.E.P.3 Bn3 [B - bombardement - bomber ; Bn - bombardement nuit - night bomber).
To complicate matters and because the French industry was strained to build the complex Caproni bombers, there were also bombers delivered to France from the Caproni factory. These were identified as C.A.P. 1 B2, C.A.P. 2 B2 and C.A.P. 3 Bn3. 
Beware: these French ID's were different from the ID's given by the Italian forces [Ca.3 and C.5) for these trimotors. To complicate things even further the Caproni factory introduced retrospectively new ID's for the Ca.3 and Ca.5 which differentiated far more than in the WW1 time.