UK Pauses Project STOKES as U.S. Surveys Mobile Mortar Market
The Ministry of Defence has paused Project STOKES, its effort to explore the acquisition of mobile 120mm mortars, pending further decisions on priorities, resources and funding. At the same time, the U.S. Army is conducting a market survey to identify potential suppliers and assess the technology available for mobile 81mm and 120mm mortar systems.
The two developments do not signal an immediate joint procurement effort or a contract between the two countries. They are nevertheless significant because mobility, rapid deployment and displacement, and automated fire-control systems are emerging as key requirements for the next generation of mortar capabilities.
Project STOKES: Objectives and Current Status
According to a written answer submitted by the UK Ministry of Defence to Parliament on July 17, 2026, Project STOKES is examining ways to provide close indirect fire and precision-strike capabilities across all operational environments. A central objective is to support lightweight, high-readiness forces that require a high degree of mobility.
The program’s main focus is a 120mm mortar intended to replace the British Army’s 105mm light gun and 120mm mortar. Both existing systems are scheduled to retire around 2030, prompting the UK to pursue a rapid assessment of relatively mature products already available on the market before selecting a successor.
The Ministry of Defence, however, said Project STOKES had been paused while it awaited decisions on future priorities, required resources and funding. The program should therefore be understood as being on hold amid a reprioritization of defense investment, rather than canceled or awarded to a particular supplier.
Earlier Market Engagement and the 120mm Mounted Mortar Concept
In September 2025, the UK Ministry of Defence issued a request for information on a lightweight, mounted 120mm mortar in connection with Project STOKES. The concept under consideration included a hinged mortar system that could be integrated onto light vehicles, along with a provisional requirement for approximately 60 systems.
The request was intended to gauge industry capabilities in areas such as pricing, integration and development timelines. It did not represent a contract award or final equipment selection, but it showed that the British Army was exploring a lightweight vehicle-based indirect-fire system optimized for rapid movement.
U.S. Army Surveys Suppliers of Mobile 81mm and 120mm Mortars
The U.S. Army Contracting Command–New Jersey issued a Sources Sought notice on June 22, 2026, covering mobile 81mm and 120mm mortar systems. The notice was updated in July, with the aim of identifying potential suppliers that have production-ready mobile platforms and associated systems.
The mobile mortar system outlined by the U.S. Army consists of four main elements: a mobile capsule with automated emplacement, displacement and laying capabilities; the mortar weapon; a fire-control system; and an onboard ammunition-storage system.
The mobile capsule must be mountable on the Infantry Squad Vehicle-Utility (ISV-U). The Army also requires a modular design that could be integrated, if necessary, with the CATV, HMMWV or future light tactical vehicles. The ability to rapidly detach the mortar from the vehicle for dismounted operation is also included among the requirements under consideration.
What the U.S. Survey Reveals About Future Capabilities
The U.S. Army is asking industry to provide information on systems that can be developed, integrated, tested and fielded quickly. The notice calls for prototypes to be delivered for government evaluation by fiscal year 2028, and indicates that large-scale procurement could follow if the systems meet the technical requirements.
The notice is not a formal solicitation or contract award, however. Rather than suggesting that a particular company or system has been selected, it indicates that the Army is broadly exploring mobile mortar technologies that offer faster deployment and improved survivability than traditional towed and manually operated systems.
In a separate capability-development effort, the U.S. Army is also examining ways to increase the range and lethality of 81mm mortars. Army materials describe plans to link improved 81mm ammunition and infantry battalion mortar systems with existing fire-control and mobility platforms, placing them within the same broader trend as the mobile mortar market survey covering both 81mm and 120mm systems.
Implications of the UK and U.S. Mortar Programs
The British and U.S. notices are not directly connected programs. The UK is seeking a successor capability for its existing 105mm light guns and 81mm mortars through a 120mm system, while the United States is assessing modular platforms and automated systems capable of operating both 81mm and 120mm mortars.
Their common requirements include mobility on light vehicles, automated laying and rapid emplacement and displacement, and integration with digital fire-control systems. On battlefields increasingly shaped by drones and counter-battery detection systems, the ability to change position quickly after firing is directly tied to mortar survivability.
Whether the UK resumes its program and how the U.S. evaluates its prototypes could influence market-entry strategies among defense contractors. Systems that combine 81mm and 120mm weapons within a single modular operating concept—or support both vehicle-mounted and dismounted operation—could become a central focus of competition.
Frequently Asked Questions (FAQ)
What is Project STOKES?
Project STOKES is a British program exploring the acquisition of mobile 120mm mortars to strengthen the UK military’s close indirect-fire capability. It also includes efforts to identify a successor capability for 105mm light guns and 81mm mortars.
Has the UK canceled Project STOKES?
No. The Ministry of Defence has not said that the program was canceled. It has described the project as paused until decisions are made on future priorities, resources and funding.
Is the U.S. Army’s mobile mortar market survey a contract?
No. The notice is part of the Sources Sought stage, intended to identify potential suppliers and assess available technologies. The notice itself does not represent a contract award or the selection of a specific supplier.
What caliber of mobile mortar is the United States seeking?
The U.S. Army is examining both 81mm and 120mm mobile mortar systems. It is also interested in modular systems that can switch between the two calibers.
What vehicles are specified in the U.S. market survey?
The primary requirement is integration with the Infantry Squad Vehicle-Utility, or ISV-U. The Army also calls for a design that can be adapted to the CATV, HMMWV and future light tactical vehicles, along with a dismounted operating capability.
How could these developments affect South Korean-U.S. or UK-U.S. defense cooperation?
Based on the information currently available, it is not possible to conclude that they will lead to direct joint procurement or a specific cooperation agreement. However, growing demand for mobile platforms, automated fire control and rapid emplacement and displacement could create more opportunities for cooperation among relevant technologies and defense companies.
