Carter's short bio 1. 06 Apr 1917 1020 3N Sopwith Pup (N6160) Halberstadt D.III (OOC) Bourlon Wood.
2. 23 Apr 1917 1730 3N Sopwith Pup (N6179) Albatros D.III (DES) Epinoy.
3. 23 Apr 1917 1800 3N Sopwith Pup (N6179) Albatros D.III (OOC) Epinoy.
4. 29 Apr 1917 1115 3N Sopwith Pup (N6179) Albatros D.III (OOC) SE of Cambrai.
5. 27 May 1917 0740 3N Sopwith Pup (N6474) Albatros D.III (OOC) E of Bullecourt.
The writings of Stewart K. Taylor (Canada's AAHS secretary for many years) may yield a clue to this. I also know there are a few articles in the old C&C USA and maybe in the C&C GB (later (intl.) that migh have a thing or two. Another soucre might be Mike Westrop hisself.