Princes William and Harry have given their support to a special event aimed at raising money to help injured members of the armed forces.
The pageant will feature an RAF fly-past
The Princes are patrons of the City Salute Appeal, launched on Thursday to support a sports complex and swimming pool for injured victims.
A procession of fly-pasts, navy bands and ceremonial troops will take place outside St Paul's Cathedral on 7 May.
Prince William also paid special tribute to medical and casualty teams.
"As brothers, we are delighted to be supporting the City of London in saluting all those who serve their country," he said.
"As well as raising money for vital rehabilitation facilities, City Salute is an opportunity for us all to celebrate the fantastic contribution made by our servicemen and women and their families."
Organisers are hoping that crowds will donate money to help fund Headley Court, a tri-service Defence Medical Rehabilitation Centre.
Two forces charities, Help for Heroes and the Soldiers, Sailors, Airmen and Families Association, will also benefit from the fundraising campaign.
The event is being produced by organisers at LiveNation, who worked on last year's Concert for Diana and Live Earth.