HMS Stirling Castle has been officially welcomed into Britain’s military force after a ceremony was staged marking the former Royal Fleet Auxiliary vessel’s commissioning as a Royal Navy warship.
The mine countermeasures (MCM) mothership, originally acquired as a commercial off-the shelf (COTS) capability in 2023, has been equipped as an operational hub to deploy surface and underwater drones to detect and neutralise subsea threats.
As per an RN press statement, the 97-metre, 6,000-tonne vessel first technically became an RN warship almost 12 months ago, hoisting the White Ensign in Birkenhead in July 2025.
Based out of HMNB Portsmouth, she has spent most of the intervening year in waters off the U.K., but recently sailed to Gibraltar to deliver drones and other MCM equipment in preparation for a potential freedom-of-navigation mission in the Strait of Hormuz.
Last week, however, having returned to Scotland, VIPs joined sailors and their families for a celebratory ceremony marking the ship’s RFA-to-RN transition in the the Firth of Forth. The event was staged at the Port of Grangemouth, as close as possible to the new warship’s affiliated city of Stirling.
Commanding Officer HMS Stirling Castle, Commander Phil Harper, said: “A ship commissioning is like a christening, and like the best christening events, we are surrounded by the friends and family that give meaning to our service.”
The ship’s sponsor, Baroness Davidson of Lundin Link, added: “Without ships like Stirling Castle to deliver the embarked teams and equipment to the minefield, there is no way to deploy autonomy and uncrewed systems at range.
“With this ship informing the operation of future Royal Navy mine countermeasures support vessels, with new and evolving uncrewed systems, and with highly trained and deeply experienced sailors operating the equipment, the future of mine countermeasures is bright.”
- You can read more details on the Royal Navy website