General Sir Gwyn Jenkins: A Historic Career in the Royal Marines
General Sir Gwyn Jenkins, KCB, OBE, ADC, is a distinguished senior officer of the Royal Marines whose career is marked by historic firsts and high-level strategic leadership. In May 2025, Jenkins achieved a milestone in British military history by being appointed First Sea Lord and Chief of the Naval Staff, becoming the first Royal Marine ever to hold this prestigious office.
From his early days as a commissioned officer to commanding elite special forces and advising prime ministers, Jenkins has operated at the highest echelons of the United Kingdom's defense architecture.
Key Facts
- First Marine First Sea Lord: The first Royal Marine to be appointed First Sea Lord and Chief of the Naval Staff (May 2025).
- Rapid Promotion: Promoted to General on August 30, 2022, skipping the rank of lieutenant general.
- Elite Command: Former commanding officer of the Special Boat Service (SBS) and Director Special Forces.
- Strategic Roles: Served as Vice-Chief of the Defence Staff and Deputy National Security Adviser for Conflict, Stability and Defence.
- Combat Experience: Served in conflicts including The Troubles, the War in Afghanistan, the Iraq War, and with the International Force East Timor.
Early Life and Military Foundations
Jenkins began his academic journey at Malmesbury School before entering military service. He was commissioned into the Royal Marines in 1990, starting his career as a junior officer within the Commando Logistics Regiment. His early operational experience included deployments to Northern Ireland with 42 Commando.
Committed to professional development, Jenkins attended the Military College Shrivenham, graduating in 2004 with a master's degree in defence studies.
Rise Through the Ranks and Special Operations
By 2009, Jenkins had ascended to the role of commanding officer of the Special Boat Service (SBS), the UK's elite maritime special operations unit. His leadership during this period led to his promotion to full colonel on July 1, 2011.
In October 2011, Jenkins deployed to Afghanistan as the commander of all British Special Forces in the theater. For his gallant and distinguished services between October 2011 and March 2012, he was appointed an Officer of the Order of the British Empire (OBE).
Strategic and Political Appointments
Following his time in Afghanistan, Jenkins transitioned into high-level policy and advisory roles. In 2012, he served as the military assistant to the prime minister. His trajectory continued upward with several key appointments:
- 2015: Promoted to full brigadier.
- 2016: Deputy National Security Adviser for Conflict, Stability and Defence.
- 2017: Commander of 3 Commando Brigade.
- 2019: Assistant Chief of the Naval Staff (Policy).
- 2021–2022: Director Special Forces.
Generalship and Senior Leadership
On August 30, 2022, Jenkins was promoted to General, skipping the rank of lieutenant general. This made him the first Royal Marine full general since 2016 and only the second since 1977. Alongside this promotion, he was appointed as an aide-de-camp to Queen Elizabeth II and took on the role of Vice-Chief of the Defence Staff.
On November 25, 2022, he succeeded Lieutenant General Sir Robert Magowan as the Commandant General Royal Marines, becoming the first full general to hold the position since the 1970s.
Controversies and Career Shifts
Jenkins' career has not been without scrutiny. In 2024, Prime Minister Rishi Sunak announced Jenkins as the next National Security Adviser, but this appointment was later cancelled by Prime Minister Sir Keir Starmer in August 2024.
Reports from the BBC's Panorama and The Daily Telegraph have highlighted controversies regarding the resettlement of Afghan personnel. These include allegations that a Special Forces officer under Jenkins rejected over 1,500 resettlement applications and a 2022 data breach involving the personal details of 25,000 Afghans. Reports suggest these incidents influenced the decision to move Jenkins into the role of First Sea Lord rather than National Security Adviser.
Career Summary
| Year | Role / Achievement | Significance |
|---|---|---|
| 1990 | Commissioned into Royal Marines | Entry into service |
| 2009 | CO, Special Boat Service | Elite command leadership |
| 2022 | General / Vice-Chief of the Defence Staff | Skipped lieutenant general rank |
| 2022 | Commandant General Royal Marines | First full general in role since 1970s |
| 2025 | First Sea Lord and Chief of the Naval Staff | First Royal Marine to hold the office |
Frequently Asked Questions
Why is General Sir Gwyn Jenkins' appointment as First Sea Lord historic?
It is historic because he is the first officer from the Royal Marines to be appointed as the First Sea Lord and Chief of the Naval Staff, a role traditionally held by Royal Navy officers.
What is the Special Boat Service (SBS)?
The Special Boat Service is the United Kingdom's elite maritime special operations force, specializing in amphibious warfare and reconnaissance.
Which conflicts has General Jenkins served in?
He has served in The Troubles in Northern Ireland, the International Force East Timor, the War in Afghanistan, and the Iraq War.
What honors has General Jenkins received?
He is a Knight Commander of the Order of the Bath (KCB) and an Officer of the Order of the British Empire (OBE).
Why was his appointment as National Security Adviser cancelled?
According to reports by The Daily Telegraph, the cancellation was linked to a national security incident involving a data breach of Afghan resettlement applicants in February 2022.