It was a fiasco. I. in 1965 was the O/C records on 90 Sqn. The whole story of their involvement with the B17 was laid out.
Fantastic! Fly at 30 thousand feet and nothing could touch you. All the breathing gear. electrical heated suits but no knowledge of upper air winds to guide the bomb aimers and then there were the Me 109s that could get up to 30 grand. Rear gunners? The B17 hadn't invented the bicycle seat so that a gunner could crouch under the fin assembly and shoot back. Two waist gunners constantly bumping into each other would try and protect the tail.
The squadron records didn't mention morale, Probably for a good reason.