Merriam Press World War 2 In Review Special Number 12. First eBook Edition, 2016. Twelfth in the Special series of the World War 2 In Review journal. Pictorial overview with 676 photos, illustrations and drawings of the M4 Sherman, officially the Medium Tank, M4, covering its design, production, service, armament, armor, and variants. The M4 Medium Tank was the primary battle tank used by the United States and the other Western Allies in World War II, and proved to be a reliable and highly mobile workhorse, despite being outmatched by heavier German tanks late in the war.