Prince Harry will be attending a service of dedication to unveil the Bastion memorial at the National Arboretum, to remember those who lost their lives in Afghanistan.
The memorial pays tribute to the names of all 453 UK personnel who died in Afghanistan.
The Prince, who served as a helicopter gunner, will join families of the fallen. Including Jacqui Thompson from Nottingham, whose husband Gary died in Afghanistan in 2008.
The service of dedication, which has been blessed by the Archbishop of Canterbury, is expected the attract 3,500 people to the Bastion Memorial at the National Memorial Arboretum in Staffordshire.
The service, which will also be attended by senior politicians, military representatives, military charities and the UK's Nato allies will include a one-minute silence.
The event will come to a close with a reception, hosted by the Royal British Legion, for bereaved family and friends.