Prince William, Prince of Wales (in his role as Colonel of the Welsh Guards) leaves Buckingham Palace, on horseback, to carry out The Colonel’s Review at Horse Guards Parade on June 10, 2023 in London, England.

Prince Williamjust had a rare royal repeat!

Last Saturday, the Prince of Wales had the honor ofleading rehearsalsforKing Charles’Trooping the Colourbirthday parade on June 17. Prince William, 40, took the salute at the Colonel’s Review at Horse Guards Parade in London, the last evaluation before the big day. William executed the duty as Colonel of the Welsh Guards, one of the seven regiments of the Household Division of the British Army that unite for Trooping the Colour each year.

The review was significant as Prince William’s first as ceremonial head of the Welsh Guards — just one year after performing the duty as the Colonel of the Irish Guards.

Prince William.Karwai Tang/WireImage

Prince William, Prince of Wales carries out the Colonel’s Review at Horse Guards Parade on June 10, 2023 in London, England.

Karwai Tang/WireImage

According to theBritish Army, only one “colour,” or flag, of the five regiments of Foot Guards can troop at a time before the sovereign during theirofficial birthday paradeeach year. The Grenadier Guards, Coldstream Guards, Scots Guards, Irish Guards and Welsh Guards rotate annually and the Welsh Guards take their turn this year.Gert’s Royalsnotes that the Colonel of the respective regiment leads the review the week before Trooping the Colour, and Prince Williamalso led the charge in 2022for his now-former colonelcy of the Irish Guards — meaning he had the rare distinction of performing the Colonel’s Review in back-to-back years.

There was a reshuffling of royal roles followingQueen Elizabeth’s death in September, and King Charles succeeded his mother as Colonel-in-Chief of all seven regiments of the household division. He soon named Prince William andKate Middletonthe Prince and Princess of Wales, andofficially madehis eldest son the Colonel of the Welsh Guards — tying in with his title as heir — in December.

Prince William, Prince of Wales carries out the Colonel’s Review at Horse Guards Parade on June 10, 2023 in London, England.

The King also made his daughter-in-law the Colonel of the Irish Guards, a fitting tribute as Kate has honored the regimentalmost every St. Patrick’s Daysince marrying into the royal family in 2011.

Queen Camillaalso became Colonel of the Grenadier Guards, an honor that wasremoved from Prince Andrewlast year along with his other military titles and patronages, in the same sweep.

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Prince William.Tristan Fewings/Getty

Prince William, Duke of Cambridge, Colonel of the Irish Guards leads The Colonel’s Review at Horse Guards Parade on May 28, 2022 in London, England.

Tristan Fewings/Getty

“The purpose of the Colonel’s review is to decide that they are ready for the monarch," an army sourcetold PEOPLE, and Prince William’s latest review looked much like last year’s — the only clue was the plume! The prince wore aSt. Patrick’s blueplume in his classic bearskin hat to match the mantle and sash of the Order of St. Patrick. This year, William swapped the feather for the Welsh Guards’ white and green version.

There was another uniform change to reflect Prince William’s new role as well. On the neckline of his red uniform — famous from his 2011 wedding day to Kate — the on the previous symbol of a shamrock for the Irish Guards was replaced with a leek, one of the Welsh Guards' motifs.

Prince William, Duke of Cambridge, Colonel of the Irish Guards leads The Colonel’s Review at Horse Guards Parade on May 28, 2022 in London, England.

Prince William also wore the royal cyphers of both Queen Elizabeth and King Charles on his shoulder for the Trooping the Colour rehearsal. The heir previously wore thetweak to his uniformduring an investiture ceremony at Windsor Castle last month to signify his role as an aide-de-camp to Queen Elizabeth and King Charles.

Elsewhere during the June 10 rehearsal, at least three soldiersfaintedin the summer heat, theAssociated Pressreported. Afterward, Prince William thanked everyone who came out to practice with a personal message on Twitter.

Trooping the Colour rehearsal.Karwai Tang/WireImage

A member of The Band of the Welsh Guards faints as Prince William, Prince of Wales Carries Out The Colonel’s Review at Horse Guards Parade on June 10, 2023 in London, England.

“A big thank you to every soldier who took part in the Colonel’s Review this morning in the heat. Difficult conditions but you all did a really good job. Thank you. W,” he wrote.

On Saturday, 1,500 soldiers, 300 horses and 400 musicians will come together for a patriotic display of military precision, horsemanship and fanfare. King Charles’ first Trooping the Colour as sovereign comes just six weeks after hishistoric coronationon May 6.

source: people.com