According p. 202 of
https://www.bombercommandmuseumarchi...ombgunnery.pdf Frankel received his bomb aimer training in Canada, latter half 1943.
Check text in Course 89 Air Bomber.
Sustained injuries in 1944 or later?
Also see
https://www.thegazette.co.uk/London/.../1771/data.pdf for resignation of commission, 16 April 1947.
Leendert