Insider says only hull redesign can save British Ajax

The British Army’s troubled Ajax armoured fighting vehicle has returned to the centre of national criticism in recent days, after new noise-related injuries forced the suspension of training and sent 31 soldiers to hospital.

According to a source familiar with U.K. military procurement, the programme’s difficulties have entered a new and more serious stage, raising questions about whether the Army can justify continuing a project that has absorbed £6.1 billion ($8 billion) over fifteen years without delivering a fieldable capability.

The source said the programme began as “a bold and ambitious project that would replace the British Army’s ageing family of CVR(T) reconnaissance vehicles with an advanced, fully-digitised capability.” Fifteen years later, the Army remains without an operational vehicle, and the delays have triggered a new public debate about the government’s oversight of major defence programmes.

The latest breakdown came only weeks after the Army declared that Ajax had reached initial operating capability in November 2025. That announcement followed an earlier claim in June that the platform’s long-running technical issues had been fixed. But training units soon began reporting familiar symptoms. Soldiers suffered vomiting, shaking and ringing ears.

According to the insider, “31 soldiers were admitted to hospital suffering from vomiting, shaking, and ringing ears – symptoms of excessive noise and vibration.” Trials were suspended again while the Government deliberates over next steps.

The source argues the roots of the failure run deep. From the outset, the Army issued “over 1,000 separate system requirements” in the RFP, producing a programme whose scope far exceeded the capabilities of the ASCOD platform on which Ajax was based. In an effort to accelerate schedules, “the usual Concept, Assessment, Demonstration, Manufacturing, In-Service, Disposal (CADMID) acquisition process used by the UK Ministry of Defence was condensed so that the Demonstration and Manufacturing phases were combined.” Production began before a final specification had been agreed.

After signing the contract, the Army revised its requirements. The insider said the service demanded higher protection levels, pushing the weight from the original 19-tonne ASCOD design to “36 tonnes” in base configuration and “43 tonnes” with appliqué armour. “From the outside looking in, it appears that ‘scope creep’ resulted in a vehicle that exceeded the capacity of the ASCOD platform on which Ajax was based,” the source said.

According to the insider, GDLS accepted a fixed-price contract, meaning each engineering change increased delivery time and reduced the contractor’s profit margin. The resulting friction strained the relationship between GDLS UK and the Ministry of Defence, creating what the source described as “a tense working relationship.”

Public criticism escalated in 2016 as delays mounted. By 2021, the programme reached a crisis point when noise and vibration issues emerged. What was not known at the time, the source said, was that “testing had been halted in 2020,” and that the Institute of Naval Medicine had been asked to conduct an assessment.

According to the insider, the INM’s report “had been suppressed both internally and externally.” Without access to this information, the Armoured Trials & Development Unit resumed vehicle testing, resulting in permanent hearing injuries for multiple soldiers.

The disclosure caused a scandal that embarrassed the government. Senior ministers, including Jeremy Quin and Ben Wallace, were unaware of the scale of the issues. An inquiry was launched, followed by the commissioning of the Sheldon Report. At one point, the Secretary of State considered cancelling the programme. But when it became clear that cancellation would recover none of the money spent and that GDLS had contractually fulfilled its obligations, the Government opted for another reset.

Despite that decision, the latest failures show that core issues persist. The source said: “Today, the British Army is in exactly the same position as it was five years ago.” Between 2021 and 2025, spending rose from £4.3 billion ($5.6 billion)  to £6.1 billion ($8 billion), yet no deployable AFV exists. Attempts to mitigate noise and vibration — including “noise cancelling headsets and extra seat cushioning” — have not addressed the underlying causes. “Pieces of metal have been welded to various parts of the vehicle to dampen vibrations, but this do not appear to have worked,” the insider said.

Cavalry units now lack confidence in the AFV altogether. In operational terms, the insider argues the platform is poorly suited to how the Army expects to fight in the coming years.

“In Ukraine, armoured vehicles operating forward without infantry have proved to be extremely vulnerable to ATGM and drone attack. In future, reconnaissance tasks will primarily be performed by UAVs and more stealthy ground vehicles.” The source concluded that Ajax “has failed again, politically, economically, and militarily.”

The insider believes the only realistic technical fix would require deep structural changes. “The Commander of the Armoured Trials & Development Unit (ATDU) told his superiors in 2020 that the only way to fix Ajax was to redesign the hull (including the engine mountings) and the running gear. He also suggested adopting Horstman’s hydro-pneumatic suspension and composite rubber tracks.” The Army did not pursue this option.

In the source’s view, “this is the ONLY viable fix.” Without such work, the programme is unlikely to deliver a functioning AFV. The insider also pointed to a related example: “General Dynamics has fixed Ajax. It’s called the M10 Booker.” The company initially considered using the Ajax chassis for Booker but determined “that it wasn’t up to the job,” leading to a new design.

The Booker features a 38.5-tonne platform, strong frontal protection, a forward-mounted 800 hp Rolls-Royce/MTU engine, a redesigned hull, new running gear, and Horstman in-arm hydro-pneumatic suspension. Designed as an expeditionary light tank, the insider argues it “can do everything that Ajax was intended to do,” and that its 105 mm gun provides greater lethality than the Ajax’s 40 mm CTAS cannon.

However, Booker is not a derivative of Ajax, but “a brand new vehicle.” At an estimated £11 million ($15 million) per unit, the cost of acquiring the fleet required to replace Ajax would approach £6.5 billion ($8.5 billion), while still leaving the Army without the additional APC variants it needs. After the U.S. Army’s cancellation of the programme, the platform also lacks an export base, further complicating its viability for the U.K.

In the insider’s assessment, the core problem is that “Ajax is no longer suitable for the original role it was intended to perform.” Instead, the Army needs “an armoured vehicle that acts as a drone mother ship,” reflecting Ukraine’s influence on modern doctrine. The source said the British Army also faces a growing requirement for a new tracked infantry fighting vehicle — a role Ajax cannot fulfil.

The insider’s recommendation is direct: “I believe we need to cancel Ajax.”

He suggests acquiring a turreted version of Boxer as a wheeled cavalry vehicle for fire support, drone operations, artillery fire control, counter-UAS work, and long-range overwatch. In his view, the Boxer RCT30 variant built for Germany and the Netherlands offers a mature and proven solution. Later, when funding allows, the Army could acquire a new tracked IFV such as Puma or KF41.

Ajax’s problems have repeated in cycles for nearly a decade. Public concerns first surfaced in 2016, followed by a deeper crisis in 2021 when noise and vibration injuries emerged. Testing had already been halted in 2020, but this information had not been shared across the Ministry of Defence. The Institute of Naval Medicine’s assessment, which identified the health risks, was not disclosed until later.

By the time these issues became public, the Army’s senior leadership had already taken steps to shield the programme from scrutiny ahead of the Integrated Review. Ministers were unaware of the suppressed findings, creating a political shock once the information reached Parliament. The commissioning of the Sheldon Report marked the Government’s attempt to restore transparency.

The decision to continue the programme instead of cancelling it set the stage for the next four years of additional spending and further attempts at remediation. Multiple resets, engineering adjustments and revised timelines followed. But by 2025 the fundamental problems persist, and the Army remains without a functioning armoured fighting vehicle.

In the insider’s words, Ajax represents “the perfect example of the ‘sunk cost fallacy.’”

Despite billions spent, the latest string of injuries suggests the platform cannot be rescued without a full redesign — a redesign the Ministry of Defence has so far declined to initiate.

The Ajax crisis is more than a procurement failure. It reflects a systemic issue inside the U.K.’s defence acquisition system at a time when European militaries are expected to modernise quickly.

The story illustrates the risks that come with compressed acquisition cycles, shifting requirements, and fixed-price contracts applied to evolving designs. It also highlights the operational lessons from Ukraine: reconnaissance, survivability and vehicle design now depend heavily on drones, electronic exposure and dispersed manoeuvre.

Whether the U.K. chooses to redesign the Ajax AFV, replace it with a wheeled platform like Boxer, or cancel the programme outright, the decision will shape how Britain contributes to coalition operations in Europe. It may also inform how the U.S. Department of War and American industry approach next-generation armoured platforms. The insider’s assessment underscores a core point: after fifteen years, the U.K. still lacks the modern armoured fighting vehicle it set out to build — and cannot afford another decade without one.