The 37-mm gun, M1916, is a flat trajectory weapon of the field-gun type which fires high explosive shells or low-explosive shells that weigh slightly more than a pound.
Пишут, при отправке на фронт M1916 меняли на 37mm M3A1 AT.
While the TO&E prescribed 20mm guns, battalion AT platoons were actually armed with obsolete 37mm M1916 infantry "AT" guns due to the priority of fitting available 20mm guns aboard ships. The M1916s, used as training weapons, were replaced by 37mm M3A1 AT guns before the units were committed to combat.