The M198 is a towed howitzer used by the United States military and several other countries. It has a caliber of 155 mm and is designed to provide indirect fire support for ground troops. The M198 can fire various types of ammunition, including high-explosive and smoke rounds, and has a maximum range of approximately 18 kilometers (11 miles) with standard shells. Introduced in the 1980s, the M198 replaced the older M114 howitzer. It is known for its mobility and versatility, allowing it to be towed by vehicles like the HMMWV (High Mobility Multipurpose Wheeled Vehicle) or M939 series trucks. The M198 has been used in various conflicts, demonstrating its effectiveness in artillery support roles.