I have a CORRECTION!
I thought that my Grandfather would have been "just" in the 57th, I was wrong. Dominique(who is wonderful!) has told me that ... the 57th Bomb Wing was activated in Corsica in April 1944 only.
SO, I guess either before or after that date my Grandfather would have been in the 47th BW:
...12th Air Force - 47th Bomb Wing - 310th BG - 428th BS.
Anyone have any attachment to this one? Thanks.