Canadian Service Numbers In WW2

I have a cover with the senders name, rank and serial number on the reverse.


C.E. Morin
AB
V-4331

Does anyone know what the prefic V was used for.

There were 11 military districts in Canada, numbered from 1 to 13 (with 8 and 9 left out), and Regimental Numbers were prefixed with the letters A, B, C, D, E, F, G, H, I, J, K, L or M. depending on where the service man was recruited

R&J were used for the RCAF

and W for women other ranks
.
I have seen a suggestion that V was used for female officers but officers were normally identified by name and rank. Also V does not agree with the apparent rank of A.B. in the return address.

I am assuming, without any proof, that the sender was Canadian

Any thoughts would be most welcome..

AQ

V was for "volunteer".