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The Queen didn't let a little shower dampen her spirits as she rode with her head through the sunroof on Thursday.
The 91-year-old monarch, who looked resplendent in pink, joined officers as they stood with their heads through the roof of her Range Rover to arrive at Hyde Park in London to mark the 70th anniversary of the King's Troop Royal.
The Queen, who looked vibrant in a bold pink suit and matching hat, is Captain General of the King's Troop and received a royal salute before she inspected the unit in a parade.
Standing in a state review Land Rover, the Queen was driven passed the massed ranks of the King's Troop Royal Artillery - formed in October 1947 at the request of the King who wanted a troop of horse artillery to take part in the great ceremonies of state.
The Troop are famed for firing gun salutes on royal anniversaries and state occasions, and for providing a gun carriage and a team of black horses for state and military funerals.
Equipped with 13-pounder field guns dating from the First World War, the soldiers are superb equestrians who, when not performing ceremonial duties, can be deployed around the world on operations.
After inspecting the ceremonial unit, the Queen took her place on a dias in Hyde Park to receive the royal salute of the servicemen and women as their guns and horses thundered past
The King had requested the Troop be formed in the post-war period as the last batteries of horse drawn artillery were being mechanised and in October 1947 he inspected the new unit.
When signing the visitors' book after the ceremony George famously crossed out the unit's old name of Riding and inserted above it King's, so it read King's Troop, Royal Horse Artillery.
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