According to
Faswc, he was Sergent. I don't know when he became an officer but I guess it was much later than 1916. Chaput enlisted as Soldat in august 1914 and was promoted to Caporal in march 1915.
We have some infos about the planes he flew in early 1916 (in Pegase n°27):
-A new Nieuport 11 N860 from 13 march to 18 march, damaged during his 2nd victory combat.
-The replacement Nieuport 11 N940 was delivered 8th april.
While waiting his new "Bébé", he flew a tired Morane N , "one of the last 2 in Verdun area"
Gilles