ARX Robotics’ GEREON UGV Validated in Largest US-Led Experiment

ARX Robotics UK’s GEREON UGV Trial at Fort Irwin

ARX Robotics UK’s eight GEREON uncrewed ground vehicles successfully completed battlefield missions across reconnaissance, electronic warfare, logistics, and casualty evacuation during the largest experiment to date in the US Army’s modernization campaign, Project Convergence-Capstone 6. The trial at Fort Irwin, California, brought together more than a month of testing with allied forces from the US, UK, Australia, Canada, and New Zealand – the so-called Five Eyes nations – to evaluate how autonomous systems perform under realistic, contested conditions.

The vehicles, remotely operated over harsh desert terrain, were fitted with payloads including L3Harris electronic warfare systems, MyDefence counter-drone sensors, and Overview targeting equipment. They carried out intelligence-gathering, disrupted enemy drones, delivered supplies to forward positions, and evacuated casualties – all while feeding sensor data directly into brigade-, division-, and corps-level allied command networks. This seamless data flow was a core aim of the exercise, which sought to validate the US Army’s Next Generation Command and Control framework.

British Army Experimentation & Trials Group commander Colonel Jim Howard described the exercise as central to delivering the Chief of the General Staff’s 20-40-40 vision, which aims to generate greater mass and operational effect through autonomous systems. ARX also tested sustainment concepts, using a Plasan ATeMM mobile energy platform to power the UGVs and assessing compatibility with the Army’s new hybrid support vehicle. CEO David Roberts said the demonstration proved that “our systems are ready to operate at scale as part of a wider allied force, rather than as standalone technology.” The company plans to use operational lessons to advance the GEREON platform and its Mithra operating system.

From Five Eyes Experiment to Future Force Integration

A leap from lab to battlefield at scale

Project Convergence-Capstone 6 is not a standard technology showcase; it is the US Army’s primary testbed for bending the force structure around emerging capabilities. By operating eight UGVs around the clock for weeks in a contested desert environment, ARX moved beyond controlled demonstrations and into the realm of force-level integration. This is the type of evidence that program managers demand before committing to production contracts, and it positions the GEREON as a credible, off-the-shelf option for programmes such as the US Army’s Robotic Combat Vehicle–Light and –Medium.

The software-defined advantage

Central to ARX’s pitch is the Mithra operating system, which enables a common, software-defined platform to accept different sensor and effector payloads rapidly. At Fort Irwin, the vehicles flew L3Harris, MyDefence, and Overview payloads – a range that would normally require several dedicated vehicle variants. This flexibility reduces the logistics tail and allows armies to repurpose the same base vehicle for electronic warfare one day and resupply the next. For acquisition authorities, that promises lower through-life costs and faster technology insertion, two priorities highlighted by the US Army’s Next Generation C2 framework.

Interoperability as a force multiplier

The participation of all Five Eyes militaries underscores a strategic shift: future land combat will demand that allied uncrewed assets talk to one another seamlessly. ARX demonstrated that its UGVs could connect to US, UK, and other allied networks at multiple command echelons. This reduces the risk of nations investing in incompatible robotic systems and increases the likelihood that UGVs will be pooled in coalition operations—a critical need as NATO and Pacific partners look to mass autonomous capabilities without fragmenting the battlespace.

What the PC-C6 Success Means for Defence Buyers and Industry

• UK Defence planners should incorporate the PC-C6 after-action report into the British Army’s 20-40-40 roadmap, using the demonstrated network integration as a baseline for future uncrewed system requirements.
• US Army program offices can now treat ARX as a viable supplier for near-term UGV competitions, given the validated multi-mission and C2 interoperability. Early engagement with the Army’s Next Generation Combat Vehicle team could shape solicitation requirements to include software-defined platforms.
• Allied standardisation bodies (e.g., NATO’s C3 Board) should study the trial’s data-sharing architecture to update interoperability protocols for ground robotics, ensuring that sensor feeds and command links remain compatible across nations.
• Competing contractors such as Rheinmetall, QinetiQ, and General Dynamics must accelerate their own software-forward UGV programmes. The GEREON trial demonstrates that armies now value payload agility and network readiness as highly as physical robustness.
• Logistics commands should pilot the Plasan ATeMM mobile energy integration seen at Fort Irwin, as the sustainment data from PC-C6 will inform how to recharge and maintain robotic fleets during extended field operations.