The first really mass produced version of the Liberator, the B-24D had improved R-1830-43 engines, and on early examples, a remotely controlled Bendix belly turret. This proved unsuccessful, and was replaced first by a tunnel gun position and later by a retractable Sperry ball turret.
B-24D 42-72843 Strawberry Bitch, seen here displayed in the NMUSAF’s WWII Gallery, is a combat veteran of the fighting in North Africa, serving with the 512th Bomb Squadron. Preserved postwar, it was flown to Dayton in the spring of 1959 for display.
Review: Consolidated B-24 Liberator: Production Line to Frontline
Review: B-24 Combat Missions: First-Hand Accounts of Liberator Operations over Nazi Europe