The Queen has paid tribute to the "loyalty and devotion" of The Royal Lancers by renaming the British Army regiment at Windsor Castle.
Accompanied by her son, the Duke of York, the monarch announced she was granting the distinction of an honorific suffix to the armoured cavalry regiment, making them "The Royal Lancers - Queen Elizabeths' Own".
The new name recognises their service to both the Queen and her mother, Queen Elizabeth the Queen Mother, as well as commemorating the monarch's 70th anniversary as Colonel-in-Chief.
The Queen's Royal Lancers and the 9th/12th Royal (Prince of Wales's), amalgamated to become The Royal Lancers in May 2015.
She praised them saying: "In the short time since I attended your amalgamation, you have established yourselves as a unified Regiment and a force without match. It gives me much pleasure to present to you your new Guidon."
"Your loyalty and devotion to duty have been tested over more than three hundred years and never found to be wanting. Acts of bravery and skill-at-arms run through your regimental history and many of your most famous feats are recalled here, carried on this Guidon."
She symbolically touched the new flag known as a Guidon, symbol of "sacred loyalty" to the Queen and to the country, to signal its handover.
The head of state met former colonels of the regiment, which is based in Catterick, North Yorkshire.
The Queen, who turns 91 this month, is in residence at Windsor. She heads to the castle in Berkshire for a month each spring for Easter Court.
The regiment's motto is "Death or Glory" and their distinctive cap badge features a "death's head" skull backed with two crossed wire lances.
Until about a century ago, Guidons and Colours were taken into battle as the distinguishing symbols and rallying points for fighting units.