M198 howitzer

M198 howitzer. The M198 is a medium-sized, towed 155 mm artillery piece developed for the United States Army and the United States Marine Corps to provide long-range fire support. Designed to be transportable by helicopter and capable of firing a wide array of NATO-standard ammunition, it served as a cornerstone of American and allied field artillery for decades. It saw extensive combat use from the Cold War through the War on Terror, before being gradually replaced by the lighter M777 howitzer.

Development and history

The development of the M198 was initiated in the late 1960s to replace the aging M114 155 mm howitzer and complement the M109 self-propelled howitzer. The Rock Island Arsenal led the design effort, with a key requirement being significantly improved range and mobility over its predecessor. Prototypes were tested throughout the early 1970s, with the system officially entering service in 1979 after rigorous trials at facilities like the Yuma Proving Ground. The program was part of a broader United States Department of Defense modernization push during the latter stages of the Vietnam War, anticipating the need for more capable artillery in potential European conflicts against the Warsaw Pact.

Design and features

The M198 is a conventional split-trail, towed howitzer with a 39-caliber barrel, constructed primarily from lightweight metals to allow transport by helicopters like the CH-47 Chinook and the CH-53 Sea Stallion. Its hydro-pneumatic recoil system and large breech allow it to fire all standard 155 mm projectiles, including high-explosive, laser-guided Copperhead, M483A1 dual-purpose improved conventional munitions, and later, precision rounds like the M982 Excalibur. The carriage provides a wide 45-degree traverse and an elevation range from -5 to +72 degrees, enabling high-angle plunging fire. A typical crew of nine soldiers or marines can emplace the weapon in under three minutes and achieve a maximum rate of six rounds per minute.

Operational history

The M198 first saw major combat with the United States Marine Corps during the Invasion of Grenada in 1983 and the United States invasion of Panama in 1989. Its most extensive use came during the Gulf War in 1991, where batteries provided devastating fire support for operations like the Battle of Khafji and the Battle of 73 Easting. The howitzer continued in service through the Bosnian War, the Kosovo War, and the early phases of the War in Afghanistan (2001–2021) and the Iraq War. In these conflicts, it was often deployed with forward observers from units like the 75th Ranger Regiment and the Special Air Service to coordinate precision strikes.

Variants

Primary variants of the design include the M198A1, which incorporated a digital fire control system for compatibility with the Advanced Field Artillery Tactical Data System. The Australian Army developed a local upgrade known as the M198HAM, which added a GPS-based navigation and pointing system. While not a direct variant, the M777 howitzer was developed as its eventual successor, utilizing titanium and advanced materials to drastically reduce weight while maintaining similar ballistic performance. Several nations, including Taiwan and Saudi Arabia, have implemented their own minor refurbishment and modernization programs for their inventories.

Operators

The primary operator was the United States, with the weapon serving in both the United States Army and the United States Marine Corps until its retirement. It has been widely exported to allied and partner nations, including Australia, which used them extensively before replacing them with the M777. Other significant operators have included Egypt, Iraq, Lebanon, Morocco, Pakistan, Saudi Arabia, Thailand, and Tunisia. Several of these nations continue to maintain the M198 in active service or reserve status, with some, like Ukraine, having received them as military aid during the Russo-Ukrainian War.

Category:155 mm artillery Category:Towed artillery of the United States Category:Cold War artillery of the United States