The Army Ground Force initially rejected the design as unnecessary but after the Artillery Board supported the Ordnance Department 100 were authorized and built.
陸軍地面部隊（Army Ground Force）最初以沒有需要為理由拒絕了這項設計，但在陸軍火砲委員會（Artillery Board）表明支持軍備部後，軍備部核准並建造了100輛M12。