Michael Foster, chairman of trustees for COPS (Care Of Police Survivors) said the memorial was a way for people who have lost family in the police force "to come together and reflect and remember their loved ones who are no longer with us".
Hundreds of people from across the country have gathered to remember police officers who've died in the line of duty.
The event was organised by the charity COPS, which was set up to help families who've lost loved ones rebuild their lives. Our correspondent Phil Brewster was there.
Representatives from police forces across the UK attend the Care of Police Survivors Annual Service of Remembrance at the National Memorial Arboretum at Alrewas in Staffordshire.
The group of cyclists who set off from London on Friday have arrived at the National Memorial Arboretum in Staffordshire. They were riding in memory of police officers killed while on duty.
A service is taking place today at the National Memorial Arboretum in Staffordshire in honour of police officers killed in the line of duty.
Ten officers have died this year, including Fiona Bone who grew up in Castle Donington.
Cyclists from the UK Police Unity Tour arrive at the COPS remembrance service.
They've cycled up from London to Staffordshire to raise money for COPS which stands for Care Of Police Survivors.
The charity helps families of officers who have lost their lives in the line of duty.