Hi Alex,
Not sure he's in a collective grave.
https://www.uswarmemorials.org/html/...ID=52&MemID=92
He was in the RCAF. Trained in Alberta.
https://archives.rcaf.museum/stanley...er-photographs
It often comes up but American members of the RCAF could transfer over to the USAAF BUT they had to first finish their tours with UK or Commonwealth squadrons. Something about the King's shilling paying for their training.
Regards,
Dave