HMS Tamar has commissioned into the Royal Navy fleet after a ceremony at HMNB Portsmouth.
The Navy's 'greenest' warship is now ready for operations alongside her sister vessels in the Overseas Patrol Squadron.
Fleet Commander, Vice-Admiral Jerry Kyd, was in attendance at the short ceremony.
HMS Tamar's Sponsor, Lady Brigitte Peach, addressed the Ship's Company alongside their Commanding Officer, Lieutenant Commander Michael Hutchinson.
Lt Cdr Hutchinson told Forces News ahead of the ceremony: "The ship’s worked really hard over the last year to generate really quickly and the commissioning is the final bit of that process.
"It’s the formal announcement that the ship has joined the fleet; that we’re fully trained, that we’ve got all of this capability, that we can deploy around the world.
"And to have done that in less than a year from signing for the ship to being fully trained, having operated with the Royal Marines and able to deploy all of our capability; it’s incredible."
HMS Tamar is the fourth of five Batch 2 River Class Offshore Patrol Vessels to join the fleet, having arrived in Portsmouth from BAE Systems' shipyards on Clyde, Scotland, at the end of March.
WATCH: Lt Cdr Hutchinson speaks to Forces News on board HMS Tamar.
It is described as the 'greenest' ship in the Navy, thanks to catalytic converters which reduce nitrogen-based emissions from her engine exhausts by up to 95%.
In her address to the crew, Lady Peach said she has been "hugely impressed by the hard-working and incredibly welcoming crew", adding: "As you take your place in the fleet, I wish you well."
She was accompanied by her husband, Air Chief Marshal Sir Stuart Peach, Chairman of NATO's Military Committee and the most senior officer within the alliance, having previously served as the UK's Chief of Defence Staff.
Representatives from Devon, Cornwall and Truro, Tamar's affiliated city, were also invited.
The commissioning cake was provided by the Royal Navy Royal Marines Charity and was cut by Gillian Hutchinson, the Commanding Officer’s wife, and Engineering Technician Niall Tinnion, who joined HMS Tamar’s marine engineering department in May.
WATCH: Forces News was given a tour around HMS Tamar earlier this year.
ET Tinnion, 19, and from Newcastle, said: "I’m the youngest on board, hence why I cut the cake so quite a privilege. It’s my first ship, life on board is hard but good fun."
HMS Tamar recently conducted board and search training with specialist commando units in Plymouth Sound.
In October, the fifth and final Batch 2 River Class Offshore Patrol Vessel arrived in Portsmouth.
The Navy said the vessel is making strides to join the operational fleet next year.
Cover image: HMS Tamar's commissioning ceremony (Picture: HMNB Portsmouth/Twitter).