A teenage boy whose father was killed during the Afghanistan conflict has told ITV News that today's ceremony honouring the war dead has helped him understand why his dad went to fight.
Brandon, aged 15, lost his father Sgt Steven Campbell five years ago when a roadside bomb exploded nearby.
It's helped me see that he was there for a good cause, and he did what he loved doing.
It's helped a lot.
As 13 years of conflict in Afghanistan officially came to an end with a special commemorative ceremony, those involved have used the opportunity to reflect on the operation.
Among them was Stuart Tootal, a former Commanding Officer for 3 Para, who resigned over the way his troops were treated.
He told ITV News that he was pleased with how the operation had improved over the past eight years, in particular in giving Afghani troops the necessary training and skills to allow them to monitor and take on terrorist forces themselves.
The Archbishop of Canterbury has honoured Britain's Armed Forces who fought and died in Afghanistan, publicly thanking them during a service held in their memory.
The end of the 13-year conflict was marked by a ceremony of commemoration at St Paul's Cathedral where the Most Rev Justin Welby paid tribute to all those who served, leaving behind family, facing danger and suffering injury.
ITV News Correspondent Neil Connery reports.
Hundreds of people gathered at St Paul's Cathedral for a service marking the end of 13 years of UK military operations in Afghanistan today.Read the full story ›
War veterans, serving soldiers and families joined together to sing the national anthem at a ceremony honouring those who fought in Afghanistan.
Aircraft from the Afghanistan campaign roared over the parade in their own salute to mark the end of the conflict.
RAF Chinook helicopters, Hercules transport planes and Tornado attack jets flew over St Paul's Cathedral as the parade through the City of London to Guildhall took place.
RAF Chinooks - used throughout the Afghanistan operation - carried out a flypast over St Paul's Cathedral as part of a ceremony marking the end of the conflict.
British service men and women are marching through London this lunchtime in a parade honouring those who served during the conflict in Afghanistan, and marking the official end of the operation.
The last remaining troops were lifted out of the Allied base in October.
The Prince of Wales was due to take a salute before the parade stepped off.
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British and coalition troops took part in an Afghanistan commemoration service in Kabul today as a similar event took place at St Paul's Cathedral in London.
A cross made of shell casings which adorned the wall of the main Allied base in Afghanistan has been rededicated at a special commemorative service honouring those who served in the conflict.
The cross was blessed by the Archbishop of Canterbury and will feature on a new Bastion Memorial Wall at the National Memorial Arboretum in Staffordshire.
The ceremony began with a prayer from the Dean of St Paul's Cathedral, the Very Reverent Dr David Ison.
We commemorate with sorrow and regret those who have died in these operations and pray for their families and friends and for all who mourn their loss.
We remember those who have been injured in body, mind and spirit and we pray for their continued wellbeing and for those who especially support them.