British Forces Atlantic Islands Demonstrate Joint Strength in Operation SOUTHERN SOVEREIGNTY

South Atlantic Islands December 2025.

Commander British Forces South Atlantic Islands, Brigadier Charlie Harmer and Lieutenant Commander Hannah Murdoch aboard HMS Forth. Photographer: HMS Forth Supplied Imagery.

In a powerful display of joint capability and commitment to safeguarding sovereignty across the South Atlantic Islands, the UK Armed Forces have successfully executed Operation SOUTHERN SOVEREIGNTY, a coordinated mission spanning South Georgia and the Ascension Island.

At the heart of the operation was HMS Forth, serving as the flagship from which Commander British Forces South Atlantic Islands directed activities, ensuring unity of effort across all domains. Alongside her core crew, HMS Forth embarked a detachment from the Royal Irish Regiment, the current Roulement Infantry Company (RIC), reinforcing the ship’s versatility in delivering joint effects. Air support was provided by RAF Typhoon aircraft and an A400M transport aircraft operating from Mount Pleasant Complex in the Falkland Islands, highlighting the reach and responsiveness of UK air power in the region.

The operation also featured a RIC detachment deployed to Ascension Island, demonstrating the ability to operate seamlessly across the Joint Operating Area. This presence underscores the UK’s enduring commitment and capacity to respond effectively to challenges in this strategically important region.

Beyond the operational objectives, UK forces supported a critical development project for the South Georgia government, facilitating the movement of essential materials. This effort, enabled by personnel from all three services, strengthens infrastructure resilience and reinforces long-term stability across the South Atlantic Islands.

Commander British Forces South Atlantic Islands, Brigadier Charlie Harmer said: “Op SOUTHERN SOVEREIGNTY enabled me to test our ability to project power across the Joint Operational Area and in the Sea, Land and Air domains concurrently. Whilst it reassures the population, ultimately it contributes to my mission to deter aggression in the South Atlantic Islands and demonstrates UK sovereignty in action.”

Operation SOUTHERN SOVEREIGNTY stands as a clear testament to the UK’s unwavering dedication to protecting sovereignty and maintaining security throughout the South Atlantic.

https://cyberandspecialistoperationscommand.blog.gov.uk/2025/12/18/british-forces-atlantic-islands-demonstrate-joint-strength-in-operation-southern-sovereignty/

seen at 14:30, 18 December in Cyber & Specialist Operations Command.