South Korea’s K9MH Wheeled Howitzer Makes US Army Debut in Bid for Major Artillery Modernization Program.

On August 18, 2026, the U.S. Army awarded Hanwha Defense USA a $100.3 million contract to deliver prototype K9 Mobile Howitzers for testing under the Mobile Tactical Cannon program. The prototype agreement allows for up to 18 K9MH 8x8 wheeled artillery systems to undergo four years of operational evaluations to determine if the platform can potentially replace M777 towed howitzers in select formations. This award initiates a competitive experimentation phase with prototype hardware rather than a final selection or serial production contract for the U.S. Army's entire artillery fleet.

The prototype agreement carries a $262.9 million ceiling to support rapid prototyping, soldier experimentation, and technical evaluations of six initial K9MH vehicles with an option for 12 additional units. Army leadership will use the four-year testing period to assess firing performance, automated loading, and operational supportability before making any downselect decision for future serial production.

Related topic: US Army fires hypersonic warhead from repurposed supergun in first Yuma Proving Ground live test

The K9MH is an 8x8 155 mm self-propelled howitzer that combines a Tatra chassis with a K9A2-derived automated turret, a 40-round magazine, and a 52-caliber CN98 cannon capable of firing nine rounds in 59 seconds. (Picture source: Hanwha Defense USA)

On August 18, 2026, the U.S. Army awarded Hanwha Defense USA, the U.S. subsidiary of South Korea's Hanwha Aerospace, a $100,302,961 contract to develop and deliver prototypes of the K9 Mobile Howitzer, or K9MH, for the Mobile Tactical Cannon (mTC) program. Under this firm-fixed-price Other Transaction Authority agreement, which has a total cumulative value of $262,903,274, Hanwha will initially provide six K9MH artillery systems, while the Army holds options for 12 additional systems, creating a potential prototype fleet of 18 wheeled 155 mm self-propelled howitzers. The US Army identifies an estimated four-year period of performance for rapid prototyping, testing, and Soldier experimentation, during which operational units will evaluate performance, reliability, and supportability in realistic conditions.

This is also the first time a South Korean defense company has secured a U.S. military program involving a complete Korean weapons system, even if this award does not mean that the K9MH will become the U.S. Army's future self-propelled howitzer. If approved, MTC is intended primarily to replace roughly 498 to 500 M777 155 mm towed howitzers in selected formations. The K9MH is still facing Elbit America's Sigma, BAE Systems' Archer, American Rheinmetall/KNDS' RCH 155, and a Leonardo DRS/KNDS Caesar proposal. The K9MH itself is substantially different from the tracked K9A1 that established the K9 Thunder family. Here, the South Korean company Hanwha combines a K9A2-derived automated turret with an 8x8 wheeled chassis from the Czech manufacturer Tatra and reduces the operating crew from five positions on the earlier K9 configuration to three personnel. The earlier crew arrangement included a commander, a gunner, an assistant gunner, a No. 1 gunner or loader, and a driver; the K9MH eliminates several manual ammunition-handling functions by using an automated loading sequence.

Its baseline weapon is the CN98 155 mm/52-caliber cannon, whose barrel length is roughly 8.06 m and which complies with the Joint Ballistics Memorandum of Understanding (JBMOU) standard for 155 mm artillery. With standard propellant charges, the stated firing range is 40 km, while rocket-assisted or comparable extended-range ammunition increases reach beyond 60 km. The automated turret uses separate projectile and charge conveyors, which removes the repeated manual handling cycle that normally slows a howitzer crew after the first few shots. During an April 2026 live-fire sequence, the K9MH fired nine rounds in 59 seconds, placing the demonstrated burst rate close to nine rounds per minute. Hanwha also places the firing-position preparation below 30 seconds. The U.S. Army's decision to begin with the 52-caliber CN98 also reflects the problem that stopped the earlier U.S. programs from reaching production.

The U.S. Army’s Mobile Tactical Cannon (MTC) program emerged from more than three decades of unsuccessful efforts to replace or substantially improve upon the M109 155 mm self-propelled howitzer, beginning with the XM2001 Crusader launched in 1994 and cancelled in 2002, followed by the XM1203 Non-Line-of-Sight Cannon under Future Combat Systems, cancelled with that program in 2009, and then Extended Range Cannon Artillery (ERCA), initiated in 2018 but terminated in April 2024. At that time, the US Army had already begun reassessing its artillery force through a conventional fires study initiated in 2023 and completed in March 2024, which concluded that future cannon artillery required greater mobility, range, and automation rather than simply extending the M109 service life.

On August 28, 2024, the Army therefore issued an industry request for mature 155 mm self-propelled systems already in service or capable of entering service by 2026 with minimal U.S.-funded development, marking a deliberate shift from designing another bespoke American howitzer toward evaluating existing systems. On October 14, 2024, it awarded five Other Transaction Agreement contracts worth roughly $4 million combined to American Rheinmetall Vehicles, BAE Bofors, Hanwha Defense USA, General Dynamics Land Systems and Elbit Systems USA for the Self-Propelled Howitzer Modernization (SPH-M) performance demonstration, with demonstrations scheduled for completion by mid-December 2024. During 2025, however, the Army Transformation Initiative changed the operational focus of the requirement: instead of concentrating first on a successor or complement to the tracked M109A7 in Armored Brigade Combat Teams, the service prioritized replacing M777A2 155 mm towed howitzers in Stryker Brigade Combat Teams, followed by Mobile and Infantry Brigade Combat Teams.

Elbit America’s SIGMA remains the closest competitor to the K9MH in automation and ammunition capacity, combining a 155 mm/52-caliber gun with a fully automated 40-round magazine on an Oshkosh-derived 10×10 wheeled chassis. It requires three soldiers, fires more than eight rounds per minute, provides 360° traverse, enters action within 45 seconds, and can use U.S./NATO ammunition including XM1113 and XM1115 for ranges exceeding 70 km. Compared with the K9MH, the SIGMA offered greater road-oriented strategic mobility and a more explicitly automated firing architecture, while the K9MH offered tracked cross-country mobility and technology derived from the K9 family already operated by multiple armies.

The Archer represents a lighter wheeled alternative built around a 155 mm/52-caliber automated gun mounted on an 8×8 tactical truck, with a crew operating the weapon entirely from an armored cab. It can enter action and fire in less than 30 seconds, leave the firing position in less than 30 seconds, fire six rounds and move 500 m within two minutes, reach 90 km/h and travel up to 650 km on internal fuel. Relative to the K9MH, the Archer emphasized rapid road movement, lower logistical burden, and very short shoot-and-scoot cycles, whereas heavier tracked self-propelled howitzers sacrifice road speed and strategic mobility for better mobility across soft ground and terrain alongside tracked maneuver formations.

For its part, the RCH 155 combined the KNDS Artillery Gun Module with the 8×8 Boxer, carrying 30 projectiles and 144 modular charges and using a 155 mm/L52 cannon capable of more than eight rounds per minute, 40 km with base-bleed ammunition and 54 km with V-LAP. At less than 40 t, it reaches more than 100 km/h and 700 km road range, needs only two crew members and, unlike the K9MH and the other MTC contenders, can fire while moving through its fully automated unmanned turret. Compared with the K9MH, its principal advantages are substantially greater automation, a two-person crew, and wheeled operational mobility, while the K9MH provides a 40-round ammunition load and a less radical artillery architecture with a larger existing K9 logistics and operator base.

Leonardo DRS and KNDS also offered the Caesar 6×6, with Leonardo DRS acting as U.S. prime contractor, making it the lightest and mechanically simplest of the principal MTC proposals rather than competing with the K9MH through extensive turret automation. The 155 mm/52-caliber Caesar family can engage targets beyond 40 km with extended-range ammunition, while the newer Caesar Mk2 weighs less than 26.7 t, fires six rounds per minute, and retains a five-person nominal crew that can be reduced to three. Compared with the K9MH, CAESAR offered much lower weight, easier C-17/C-5 air transport, and a smaller logistical footprint, but less onboard ammunition and crew protection than a turreted howitzer, making the competition a trade-off between the Caesar's deployability and the K9MH's protected capacity and sustained fire.

The K9MH (K9 Mobile Howitzer) is Hanwha Aerospace’s new wheeled 155mm/52-caliber self-propelled howitzer, combining K9-series firepower and automated ammunition handling with an 8×8 configuration designed for greater road mobility, rapid deployment, and shoot-and-scoot artillery operations.

Hanwha has nevertheless retained a growth path. In December 2025, Hanwha Defense USA entered a Cooperative Research and Development Agreement with the U.S. Army DEVCOM Armaments Center to evaluate integration of a government-designed 155 mm/58-caliber cannon into the K9 family. Hanwha's U.S. localization concept also includes 58-caliber tube upgrades and autonomous software insertion among possible later modifications. The distinction is critical for judging the 2026 system accurately: the K9MH entering US Army testing is an L52 howitzer with a 40 km standard-range figure and more than 60 km with rocket-assisted ammunition, while 70 km belongs to a possible future L58 configuration. MTC therefore lets the US Army test mobility, automation, crew reduction and resupply with a mature cannon before deciding whether the operational benefit of another 18% increase in barrel length justifies added recoil, barrel life and maintenance penalties.

Hanwha Defense USA signed a three-year lease on an idle facility in Opelika, Alabama, and began investing about $2 million to establish K9MH integration and testing capacity. Opelika is Phase I, not a complete serial-production complex, and later manufacturing phases, production rates, and site locations remain undisclosed. Hanwha Aerospace's localization model draws on K9 programs in Australia, Poland, Egypt and Romania, where workshare expanded from imported systems toward domestic assembly, sustainment and production. In parallel, Hanwha committed roughly $1.3 billion to a U.S. munitions facility in Arkansas, an investment about 650 times larger than the initial $2 million Opelika setup and aimed at the ammunition side of the artillery system.

Hanwha's Yeosu modular-charge facility currently produces about 1.2 million modules per year and is planned to reach 1.6 million in 2028, while a second facility at Boeun is intended to reach a similar annual level in 2027. Those module figures are not equal to complete artillery rounds because each shot can use multiple charge modules depending on range, projectile, and firing table, but they indicate the production scale required to support sustained 155 mm operations. A 500-gun MTC fleet firing only 20 rounds per gun during one high-intensity day would consume 10,000 projectiles; at 50 rounds per gun, daily expenditure would reach 25,000. That demand would sit alongside barrel replacement, maintenance, engine and transmission spares, autoloader parts, fire control electronics and depot repair.

Hanwha can therefore move from six prototype vehicles assembled and tested through Opelika to a production network capable of delivering hundreds of guns and their ammunition architecture without leaving barrels, propellant components or critical turret subsystems dependent on single foreign sources. The August 2026 award consequently settles only the prototype downselect and leaves the force-structure and procurement questions open. The funded quantity is six K9MHs, the agreement permits 12 more, and the maximum experimental fleet of 18 remains small compared with the earlier requirement of roughly 498 to 500 systems, as a 500-gun acquisition would be 27.8 times larger than the maximum prototype fleet.

The K9MH prototype award does not therefore constitute the U.S. Army’s final MTC acquisition decision, as 2030 is currently the planned First Unit Equipped date rather than the scheduled final selection date. The US Army’s published acquisition schedule calls for MTC competitive evaluation through FY2026, Soldier experimentation and integration testing throughout FY2027, followed by an Army Senior Leaders downselect of the final MTC solution in Q4 FY2027; the selected system would then proceed through additional engineering, ammunition integration, qualification, and production preparation before First Unit Equipped in Q4 FY2030.

The production requirement is already unusually explicit: the five MTC competitors have to demonstrate a credible plan to establish U.S. production within two years of award and reach 24 to 48 systems per year, while production unit cost, domestic supply chain capacity, ammunition compatibility, and data rights were formal evaluation criteria. Consequently, if the K9MH passes experimentation and remains the US Army’s preferred solution at the FY2027 downselect, the 2028-2030 period would principally cover maturation, U.S. industrialization, qualification, and preparation for operational fielding, culminating in the first MTC-equipped Army unit in late FY2030 rather than a new competition in 2030.

Written by Jérôme Brahy

Jérôme Brahy is a defense analyst and documentalist at Army Recognition. He specializes in naval modernization, aviation, drones, armored vehicles, and artillery, with a focus on strategic developments in the United States, China, Ukraine, Russia, Türkiye, and Belgium. His analyses go beyond the facts, providing context, identifying key actors, and explaining why defense news matters on a global scale.

Explore More Defense News

• Land Defense News
• Naval Defense News
• Defense Aerospace News