This link has a little on Green. He trained in RCAF class 61 ( August 3 - November 20, 1942). His service number was J.20981. Search for Green on the link:
http://rcafbrantford.blogspot.com/
One paragraph in the above on Green says that he was a Link trainer instructor.
The next link mentions Green in connection with flying PBY Catalinas from Canada to Great Britain via Bermuda. He may? have been a ferry pilot with the ATA at that point. Scroll down a little on the page.
https://books.google.com/books?id=5V...ermuda&f=false