Steve,
A start?
http://www.rafcommands.com/database/...php?uniq=R4394
KAARSBERG, A. C., Sgt. (908331) Toronto, (Ontario) enlisted Nov./39 and was in No.218 Squadron. In Oct./41 he was posted to Canada.
See:
Canadians in the Royal Air Force.
Allison,Les.
Roland:Author,1978.
p.156.
Col