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For example, RAF bombers at night probably didn't need the upper and forward turrets, but the rear gunner was quite valuable, even if only as an observer.
For the USAAF, the bombers may have been able to get away without the waist gunners.
Bell Atlanta built 311 stripped B-29B (only armament was radar controlled guns in the tail) between Jan & Sept 1945, interspersed on its production line with ordinary armed B-29. In WW2 most of these went to the 315th BW and were equipped with the AN/APQ-7 Eagle radar. This Wing targeted Japan's remaining oil facilities.Paul W. Tibbets found when he tested a B-29 without turrets that there was a considerable increase in performance in top speed, climbing rate, and max ceiling.
That led him to the Silverplate modifications on 509th B-29s which came from the factory without turrets except the tail turret.