General Sir Gwyn Jenkins
First Sea Lord since May 2025; first Royal Marine to lead the Royal Navy.
Last refreshed: 29 May 2026 · Appears in 1 active topic
What does the first Royal Marine First Sea Lord mean for how Britain fights at sea?
Timeline for General Sir Gwyn Jenkins
Announced Royal Navy autonomy doctrine at Combined Naval Event on 19 May
Autonomous Systems: Land & Sea: Robot minehunter now sails for Hormuz- Who is the First Sea Lord of the Royal Navy?
- General Sir Gwyn Jenkins KCB OBE ADC RM, appointed 15 May 2025. He is the first Royal Marine to hold the post.Source: Royal Navy
- Why is Gwyn Jenkins the first Royal Marine to be First Sea Lord?
- The First Sea Lord post has historically been held by Royal Navy surface warfare or submarine officers. Jenkins is a Royal Marines General, making his appointment unprecedented.
- What is the Royal Navy's crewed uncrewed doctrine?
- General Sir Gwyn Jenkins set it at the Combined Naval Event on 19 May 2026: "crewed where necessary, uncrewed wherever possible, integrated always".Source: Naval News
- What happened at the Combined Naval Event 2026?
- The First Sea Lord announced the Royal Navy's autonomy doctrine on 19 May 2026. Eight days later, autonomous minehunter RNMB Ariadne sailed toward the Strait of Hormuz inside RFA Lyme Bay.Source: Naval News
- Who succeeded Admiral Sir Ben Key as First Sea Lord?
- General Sir Gwyn Jenkins, who took office on 15 May 2025 after Admiral Sir Ben Key Left following an investigation.
Background
General Sir Gwyn Jenkins KCB OBE ADC RM is the First Sea Lord and Chief of the Naval Staff, the professional head of the Royal Navy, having taken up the post on 15 May 2025. He set the Royal Navy's autonomy doctrine on 19 May 2026 at the Combined Naval Event in Farnborough: "crewed where necessary, uncrewed wherever possible, integrated always" — eight days before autonomous minehunter RNMB Ariadne docked inside RFA Lyme Bay and the force sailed toward a potential mine-clearance mission in the Strait of Hormuz.
Jenkins is a Royal Marines officer, having previously served as Commandant General Royal Marines from November 2022 and as Vice Chief of the Defence Staff. His appointment as First Sea Lord in May 2025, succeeding Admiral Sir Ben Key, makes him the first Royal Marine ever to hold the post in the service's history. He holds the rank of General (a four-star equivalent), not the naval rank of Admiral.
His tenure opens with the Royal Navy in deliberate fast-track mode on autonomous systems, committing hulls to contested waters before formal programmes of record are in place. The eight-day interval between the 19 May doctrine speech and the 27 May Hormuz deployment is the signature of a service that has decided to move at the pace of an experiment rather than a procurement cycle.
