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In the years leading up to World War II, the United States planned a complete modernization of the Army's artillery fleet to make it more modern and effective. Great attention was paid to ammunition and trolleys. Among these projects, the M1 155/23 howitzer was developed. It was first used in 1942 as a medium artillery piece and served the US Army throughout the Second World War. It could employ different types of ammunition and had a maximum range of 14,600 meters. Very robust and reliable, it proved to have good operational longevity. It was in fact used by the US Army also during the Korean War and the Vietnam War before being replaced by the more modern M198.