A total of at least 285 M1917 (Mark 6), 116 M1918 (Mark 7), and 61 M1918 (Mark ) weapons were acquired by the US Army, plus 16 for the US Marine Corps. 52 weapons were purchased from the British beginning in January 1918; subsequent inventory figures indicate they were in addition to these totals. By 1922 the 8-inch howitzers were withdrawn from active units and stored as war reserves. A 1926 inventory showed 508 howitzers and 646 carriages in Army hands. An approximate total of 530 howitzers were acquired. In 1933 some of the howitzers' Asbury breech mechanisms were used in developing the 155 mm gun T3, eventually the M1 "Long Tom". In 1934 the Marine Corps weapons were transferred to the Army. In March 1940 466 weapons were on hand; 266 of these were authorised for transfer to the British. A further 32 weapons were transferred to Finland in September 1940. In 1941 the remaining weapons were authorised for transfer to the British under Lend-Lease. None of these weapons were donated as war memorials, and none survive in the United States.