US Army gets first mobile cannon to replace M777 howitzer, officials say

The Mobile Tactical Cannon is a 155mm self-propelled howitzer made by Hanwha Defense USA. The Army received its first system less than a year after issuing its solicitation. It matters because the service needs a newer, more mobile artillery option for future brigade combat teams.

The cannon is based on Hanwha’s K9 mobile howitzers. The Army contracted for rapid prototyping, testing, and Soldier experimentation. Its intended replacement is the towed M777 155mm howitzer, which has been in Army service since 2005. The contract allows up to 18 systems.

The Army plans to focus initial fielding on Stryker Brigade Combat Teams. Mobile and Infantry Brigade Combat Teams would follow. Officials will gather soldier feedback and conduct operational experiments before wider fielding. Army leaders want a ready version by 2031.

A self-propelled howitzer is an artillery cannon mounted on a vehicle. The vehicle carries the weapon and lets the crew move it under its own power. This combines long-range firepower with greater mobility between firing positions.

The Mobile Tactical Cannon is based on Hanwha’s K9 family and uses a wheeled self-propelled design. By contrast, the M777 is a towed 155mm howitzer. A separate vehicle must pull the M777, while the self-propelled cannon can drive as part of the artillery unit. The article identifies both as 155mm systems.

That distinction matters during operations. A self-propelled cannon can potentially relocate without waiting for a towing vehicle to reposition it. The Army is testing the design rather than assuming performance. Initial fielding is planned for Stryker brigades, followed by Mobile and Infantry brigades.

The contract gives the Army access to as many as 18 Mobile Tactical Cannons. It is worth nearly $263 million and lasts four years. The systems are intended for rapid prototyping, testing, and Soldier experimentation rather than immediate full-scale fielding.

The agreement calls for accelerated delivery of the first six system prototypes. The Army can then exercise options for up to 12 additional systems. This staged approach lets soldiers and testers examine the cannon before the service commits to broader deployment.

The Army has not yet fielded the cannon as a ready standard system. Officials plan operational experiments under realistic combat conditions. The service will initially focus fielding on Stryker Brigade Combat Teams, then Mobile and Infantry Brigade Combat Teams. Army leaders have set 2031 as the target for a ready version.

The Army will test the Mobile Tactical Cannon in realistic combat conditions because a promising design must prove dependable outside controlled demonstrations. Artillery units need systems that can perform consistently during demanding operations. Testing helps identify weaknesses before the weapon reaches many brigades.

Officials described a series of operational experiments. Soldiers will use the systems and provide feedback, which Brig. Gen. Robert J. “RJ” Mikesh Jr. called especially important. That feedback can show how the cannon functions for the people expected to operate and maintain it.

The cannon is still in a prototyping and experimentation phase. The Army will use test results to judge reliability, performance, and suitability for fielding. This evidence will inform decisions about initial Stryker brigade deployments, later brigade formations, and the goal of fielding a ready system by 2031.

The K9-based Mobile Tactical Cannon has a stated range of more than 60 kilometers. The M777 has an effective range of under 24 kilometers with standard ammunition, or up to 40 kilometers with the extended-range Excalibur round. The comparison indicates a substantial reach advantage for the K9-based system.

Using the basic ranges, the cannon can fire at least 36 kilometers farther than the M777’s under-24-kilometer range. Even against the Excalibur figure, its stated range exceeds the M777’s by more than 20 kilometers. The exact difference depends on ammunition and conditions.

Greater range can help artillery units engage targets deeper beyond their positions. It may also give commanders more options for placing firing units. The Army is studying propulsion and ammunition improvements aimed at reaching targets as far as 70 kilometers.

The Army chose a mature foreign design to move faster and reduce the uncertainty of inventing an entirely new cannon. Officials said they were seeking mature and available technologies, not a clean-sheet design. Hanwha’s K9 family already served South Korea and had variants in 10 other countries.

The contract used an Other Transaction Authority agreement under the PAE construct. Officials described this as a close partnership that allowed new contracting methods. The Army opened competition to companies worldwide, but required production to be onshore within two years. Hanwha is building an integration and test site in Opelika, Alabama.

This approach delivered the first system less than a year after the solicitation. It also creates a test base for soldier experimentation and future improvements. Hanwha’s design must still pass operational testing before the Army fields a ready version targeted for 2031.

In general, 155mm artillery fires a projectile through a barrel after an ignition system starts burning a propelling charge. The expanding gases produce pressure behind the projectile and send it toward a target. A self-propelled vehicle carries the cannon and its crew, but range depends heavily on the ammunition and firing system.

The Army’s modernization project names the propelling charge, modular charge, ignition systems, propellant, and packaging solutions as connected areas for improvement. Each part affects how consistently the system generates and controls launch energy. The cannon must safely handle those forces, while the ammunition and charges must work with its design.

The goal is a system-of-systems capability that improves range and performance while preserving interoperability. The budget document describes efforts to close fires gaps against artillery targets out to 70 kilometers. The Mobile Tactical Cannon will help facilitate this work through additional testing.