The 155 mm Howitzer is a towed howitzer built by the United States Army and used. It was first developed in 1942 as a medium piece of artillery under the 155 mm Howitzer M1 designation. Before being replaced by the M198 howitzer, it saw service with the US Army during World War II, the Korean War, and the Vietnam War. The pistol was used by other nations ' armed forces, too. The M114A1 still remains in use in some countries.