King Charles III's Birthday Celebrations: Parade, Flypast, and Security Concerns.

King Charles III rode on horseback in the first Trooping the Colour of his reign, a traditional military spectacle that marks the British sovereign’s official birthday. He joined 1,500 soldiers, 300 horses, and hundreds of musicians in the ceremony watched by members of the royal family. The monarch is head of Britain’s armed forces and would traditionally lead an army into war. After the parade, the royal party watched an extended military flypast.