A few weapons delivered to the US before the Armistice for evaluation had the Mark I carriage, but most had the Mark II carriage. 200 weapons were delivered in January 1919, and 67,000 rounds of ammunition by the end of June 1919. Most of the weapons remained unused by June 1931, when the secretary of war suggested they be disposed of through donation as war memorials. 197 guns were available for this. Despite many going to scrap drives in World War II, over thirty weapons remained on display in the US in the 2010s.