As an aside, only 3 M. Morgans joined the CEF in 1916, links as follows:
https://www.bac-lac.gc.ca/eng/discov...&Ecopy=504914b
https://www.bac-lac.gc.ca/eng/discov...&Ecopy=504913b
https://www.bac-lac.gc.ca/eng/discov...&Ecopy=504910a
All three of them joined in Toronto, so I'm thinking it's possible the "T" in TSDFA stands for Toronto.