Jimmy Stewart was with the 445th Bomb Group, a B-24 Group, as Operations Officer for the 703rd Bomb Squadron, and was then promoted to Captain, and Sqn Commander in November 1943, whilst based at Tibbenham.
January 1944, Stewart was promoted to Major, and transferred, in March 1944, to the 453rd BG, also with B-24s, at Old Buckenham, where he was Grp Ops Officer.
He was finally grounded in July 1944, with promotion to Lt. Colonel and Chief of Staff at 2nd Wing HQ.
Far as I know, he didn't fly B-17s, or command a B-17 unit.
Sander, if you could PM me your e-mail address, I'll send the photos once I've finished searching.