The Queen has marked the 70th anniversary of the King's Troop Royal Horse Artillery at Hyde Park in London.
As Captain General of the King's Troop, she inspected the unit which plays an important role at major state and royal events.
The Troop are famed for firing gun salutes on royal anniversaries and state occasions.
The Duke of Edinburgh's 96th birthday was marked with a Royal Salute in Green Park in central London in June.
After the parade the Queen attended a reception to meet soldiers and veterans of the Troop, including Percy Austen who was serving in 1947 when George VI inspected the parade.
Equipped with First World War 13-pounder field guns, the Troop also provide a gun carriage and a team of black horses for state and military funerals.
Since the Troop was formed in 1947 on the wishes of the Queen's father George V, they have played a role in many events over the years.