The Mk III introduced a three-man turret which was dimensionally larger than that as seen on the original offering which increased the total crew commitment to four personnel. The forth crewmember became a dedicated radioman and allowed the vehicle commander to concentrate on other facets of an operation instead. The Mk III was also modified as a radio-carrying vehicle in the Mk III "Rear Link" variant which installed a dummy turret with dummy gun component. A locally-produced version of the Mk III scout vehicle for the Canadian Army became the "Fox Armored Car" and these were outfitted with the readily available 12.7mm Browning heavy machine gun and 7.62mm Browning medium machine gun. Assembly practices were also streamlined to better benefit existing Canadian manufacture methodology.
In time, it was deemed that the new Humber turret could accept a 37mm anti-tank gun for light anti-armor duty. As such, existing supplies of American M5/M6 guns were fitted to new turrets at the expense of the 15mm machine gun as well as the dedicated radioman. The gun, and its requisite mounting hardware and ammunition stores, forced a slight redesign of the turret internals and hatch placement externally. Emergency rearward vision was aided by a driver-controlled aperture. Some 2,000 examples of the new Mk IV were ultimately realized by war's end.
The vehicle's baptism of fire came during the critical North African campaign which was the start of the Allied march to Rome and Berlin. Batches were fielded at this front from the latter portion of 1941 onwards and all four major marks were eventually in play by the end of the war - it was not uncommon to different variants to share a pretense on a single front. The line managed a service existence into the last fighting days of the war to which they were then sold off to British allies or shipped to far-off empirical holdings to end out their days in the security role during the massive post-war military drawdown.
In all, production of Humber Armored Cars reached 5,400 units and, by numbers alone, this made the Humber series an important contributor to the British and Commonwealth causes of World War 2. The last known cars were formally removed from service in the 1960s where they saw further combat service under the Indian Army flag - both during the successful, short-lived December 1961 Portuguese-Indian War as well as the failed 1962 Sino-Indian War with China that followed.
Other known operators were Burma, Ceylon, Cyprus, Czechoslovakia, Denmark, Egypt, Italy, Mexico, Netherlands, Poland, and Portugal.
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