The Americans were the only ones to use the M12 GMC.
Only 100 M12’s were built between Sept. 1942 and March 1943. At first it was intended that the M-12 would be only used for training in the US. However, 74 guns were remanufactured between Feb. and May 1944, to over come deficiencies in the original design. These rebuilt guns were used to equip six artillery battalions for service in NWE. No M-12’s were given to the allies, and they were never used in the Pacific Theatre. With the end of hostilities in Europe the M-12 was declared obsolete.
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