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.
A veteran of the Afghanistan conlflict has said he believes it is "superbly important" to remember what was achieved during the operation - as well as honouring those who gave their lives.
Aron Shelton spoke to ITV News ahead of a special commemorative service at St Paul's Cathedral marking the end of the Afghanistan operation, which began in October 2001.
The Queen and Prince Philip are among the guests at a special commemoration service honouring those who fought in Afganistan.
The royal family joined civil dignitaries, politicians, serving British forces personnel, veterans and families for the service at St Paul's Cathedral.
A total of 453 personnel and Ministry of Defence staff lost their lives in the conflict, which began in October 2001.
The Duke and Duchess of Cornwall are among the members of the royal family attending today's remembrance service for British servicemen and women that fought in Afghanistan.
Charles and Camilla arrived shortly after the Duke and Duchess of Cambridge and just before the Queen.
The Duke and Duchess of Cambridge have arrived to pay their respects to those who fought during the Afghanistan operation.
Prince William and Kate joined other members of the royal family, politicians, and dignitaries for the special commemoration service, as well as serving forces personnel, veterans and families.