Hundreds of people attended a ceremony at the National Memorial Arboretum in Staffordshire today.
The names of those who have been killed in recent conflicts are carved on the wall around the memorial.
Chuck Hall, a veteran of 20 years service, said:
I've come from Derby today but actually I've come from Canada, to Derby, for today... I've come to remember my buddies... I served 20 years.
Bert Hayward served in Korea and said:
I come here three, four, five times a year to pay my respects for those that have gone and those that are still serving.
A motorcycle group called Ride To The Wall has raised more than £300,000 to help with the upkeep of the arboretum which attracts thousands of visitors every year.
David Cameron has praised the "courage" and "sacrifice" of the Armed Forces.
His tweet comes as Armed Forces Day is being celebrated across Britain.
Today we pay tribute to the courage, determination and sacrifice of our Armed Forces. Their bravery keeps all of us safe. #ArmedForcesDay
The Pipe Band at West Midlands Fire Service will be in Wolverhampton today for Armed Forces Day.
Celebrations will take place across the region today to mark Armed Forces Day.
The National Memorial Arboretum in Staffordshire is holding a number of commemorative and celebratory events, including a Service of Tribute, parade and flypast.
The day gives the country an opportunity to pay tribute to serving troops, veterans, cadets and their families.
A photo collection of today's Armed Forces Day parade in Nottingham.Read the full story ›
In spite of increasing amounts of cloud today, the sun has broken through to shine on many Armed Forces Day events across the region.Read the full story ›
The Red Arrows performed a fly past during Armed Forces Day celebrations in Nottingham today.
During a trip to Afghanistan on Armed Forces Day, David Cameron said it was an opportunity to say "how proud we are of our armed forces and everything they do for us".
He also said funding from Libor rate-rigging fines would be put into military charities and a permanent memorial would be built at the National Memorial Arboretum in Staffordshire.
In terms of the political aims of the country, he said: "We want a political solution as well as making sure we have a security solution.
Mr Cameron added that it was important that the politics "enable everyone in Afghanistan to play a role in the future of their country".