Tragic Loss in Devon Training Exercise

The early hours of 3 June 2026 brought devastating news to the Royal Navy and the wider UK defence community. A Merlin Mk4 helicopter crashed during a routine training flight near Sourton Down, close to Okehampton in Devon. All three crew members on board perished in the incident. Among them was Lieutenant Lily-Mae Fisher, recognised as Britain’s only serving female Royal Navy Commando at the time of her death.

Emergency services responded shortly after 4am following reports of the crash in a rural area used for military aviation exercises. The Ministry of Defence confirmed the fatalities later that day, describing the event as a profound tragedy for the service and the families involved. Investigations into the precise cause remain ongoing, with authorities emphasising the need for a thorough and methodical review typical of military aviation incidents.

Details of the Victims

The three personnel lost were Lieutenant Commander Chris Gayson, aged 42, Lieutenant Lily-Mae Fisher, aged 31, and Petty Officer Owen Green, aged 24. Each brought significant experience and dedication to their roles within the Commando Helicopter Force.

Lieutenant Commander Gayson served as an instructor and pilot with 846 Naval Air Squadron. His extensive flying background made him a key figure in training the next generation of naval aviators. Colleagues remembered him as a professional and supportive mentor whose loss leaves a considerable gap in squadron operations.

Petty Officer Green, an aircrewman with 845 Naval Air Squadron, was known for his commitment and skill in supporting helicopter missions. At just 24, he represented the future of the force, contributing to the demanding operational tempo of naval aviation support.

Lieutenant Fisher stood out as a trailblazer. The 31-year-old from Virginia Water in Surrey had graduated from Imperial College London with a Master’s degree in Geology in 2016 before joining the Royal Navy in 2019. She balanced her military career with elite-level triathlon competition, representing Great Britain in the sport. During a pause in her pilot training, she completed the rigorous All Arms Commando Course, a 16-week programme that qualifies personnel for service with the UK Commando Force. Her achievement made her the only serving female Royal Navy Commando, a distinction that highlighted both personal determination and gradual progress in opening elite roles to women.

The Merlin Mk4 Helicopter and Its Role

The aircraft involved was a Merlin Mk4, a variant of the AgustaWestland AW101 medium-lift helicopter operated by the Royal Navy. These aircraft form the backbone of the Commando Helicopter Force, providing troop transport, casualty evacuation, and battlefield support for Royal Marines and other units. The Mk4 configuration includes advanced avionics, defensive aids, and the capacity to operate in challenging environments, including over water and in poor visibility.

Training flights such as the one on 3 June are essential for maintaining readiness. Crews practise navigation, emergency procedures, and tactical manoeuvres in designated areas like those around Dartmoor. The Merlin’s design emphasises safety and reliability, yet military aviation inherently carries risks that demand constant vigilance and rigorous preparation.

Background on Lieutenant Lily-Mae Fisher’s Career

Fisher’s path exemplified resilience and versatility. After university, she worked briefly as a geologist before committing to naval service. She progressed through flying training while seizing the opportunity to undertake commando qualification. The All Arms Commando Course tests physical endurance, navigation, and leadership under pressure, culminating in the award of the coveted green beret.

Her service included involvement in the UK military’s response to Channel migrant crossings, where personnel assisted in search-and-rescue and boat-interception operations to prevent loss of life. This experience underscored the multi-role nature of modern naval service, blending aviation expertise with broader operational demands.

At the time of the crash, Fisher was completing her final assessment flights. She was scheduled to receive her Pilot’s Wings in June 2026, marking full qualification as a Merlin pilot with 846 Naval Air Squadron. Tributes from the Royal Navy highlighted her as a talented sportswoman and dedicated officer who inspired others through her achievements.

Royal Navy Statement and Immediate Response

The Ministry of Defence issued a formal statement confirming the identities and expressing deep sorrow. It noted the deaths occurred during routine training activity and extended condolences to the families, friends, and colleagues affected. The Royal Navy described the three as “remarkable people” whose professionalism and capability would be sorely missed within the Commando Helicopter Force.

A memorial service took place in Okehampton shortly after the incident, providing an opportunity for local communities and service personnel to pay respects. Such gatherings reflect the close-knit nature of military life and the shared sense of loss when tragedy strikes during training.

Photo by Red Zeppelin on Unsplash

Investigation and Safety Considerations

Military aviation accidents trigger comprehensive inquiries involving the Defence Accident Investigation Branch and other specialist teams. These reviews examine factors including weather conditions, aircraft maintenance records, crew fatigue, and procedural compliance. Findings inform future training protocols and equipment enhancements across the armed forces.

The Royal Navy maintains one of the most demanding safety regimes in aviation, with layered checks and continuous improvement processes. Incidents like this, while rare, prompt reflection on the balance between operational realism in training and risk mitigation. Families and the wider public receive updates as appropriate, respecting the sensitivity of ongoing work.

Tributes and Public Reaction

Messages of condolence flooded in from across the defence sector, political figures, and the public. The loss of Britain’s only female Royal Navy Commando resonated particularly strongly, prompting discussions about the progress and challenges of gender integration in elite military roles.

Colleagues recalled Fisher’s determination and the pride she took in her green beret. Gayson and Green were remembered for their quiet competence and commitment to their squadrons. Social media and news coverage reflected widespread respect for the service of all three, alongside grief at their untimely deaths.

Broader Context of Naval Aviation Training

Routine training exercises prepare crews for real-world contingencies, from humanitarian assistance to high-intensity operations. The Commando Helicopter Force supports amphibious and land operations, requiring pilots and aircrew to master complex environments. The Merlin platform’s versatility demands ongoing proficiency flying, often conducted at night or in marginal weather to simulate operational conditions.

Women have served in increasing numbers across the Royal Navy since policy changes opened all roles to female personnel. Fisher’s commando qualification represented a notable milestone, achieved through the same standards applied to all candidates. Her story continues to inspire recruitment and retention efforts focused on diverse talent.

Support for Families and Service Community

The armed forces provide extensive welfare support following such losses, including bereavement counselling, financial assistance, and long-term family liaison. Regimental and squadron networks play a vital role in maintaining connections with the bereaved. The Royal Navy has emphasised its commitment to standing alongside the families of Gayson, Fisher, and Green in the months and years ahead.

Community responses in Devon and beyond included offers of practical help and quiet solidarity. Local authorities coordinated with military representatives to ensure appropriate sensitivity around the crash site and subsequent proceedings.

Looking Ahead

As the investigation proceeds, the Royal Navy will incorporate lessons learned into its training and safety frameworks. The service continues its core missions, honouring the memory of the fallen through continued professionalism and dedication. The loss serves as a reminder of the sacrifices inherent in maintaining a capable and ready military force.

Public attention has focused on celebrating the achievements of the three personnel while supporting those who continue to serve. The Royal Navy’s official channels provide updates on formal inquiries and commemorative events as they are confirmed.

Photo by Brandon McDonald on Unsplash

Further Information

Readers seeking additional verified details can consult official statements from the Royal Navy website and contemporaneous reporting from BBC News and The Guardian. These sources offer primary accounts and context without speculation.