The annual display of British military might serves as a seasonally tweaked birthday celebration for the sitting monarch.

Trooping the Colour in the U.K. is a celebration of the reigning monarch's birthday. It's held every year in June, regardless of when their actual birthday is, and it involves a lot of fanfare with a parade and a dramatic RAF flyover.

King Charles and Queen Camilla appeared at the annual Trooping the Colour celebration as the monarch continues to undergo treatment for cancer.