This year the colour of the 1st Battalion Irish Guards was trooped.
This marks the commemoration of the Queen's official birthday. Learn more here.
Some other photos, not necessarily from this year's event:
The Life Guards:
An officer of the Blues and Royals:
And now for something a bit different. Trooping the colour in Thailand, performed by the Royal Guard:
But the Thai one is more colourful. This picture does not include all the uniforms of the Guard: