The M101 Howitzer is a towed artillery piece used by the United States military and several other countries. It was designed during World War II and has a caliber of 105 mm, making it effective for both direct and indirect fire support. The howitzer can fire various types of ammunition, including high-explosive and smoke rounds. This artillery system is known for its mobility and versatility, allowing it to be easily transported by vehicles. The M101 has been utilized in numerous conflicts, including the Korean War and the Vietnam War, demonstrating its reliability and effectiveness on the battlefield.