The Horse Guards building is the headquarters of the Household Cavalry Mounted Regiment, which provides troops for the King's Life Guard (referred to as the Queen's Life Guard if the monarch is a woman). The King's Life Guard consists of soldiers from the Squadron of The Blues and Royals that are distinguishable by their red plumed helmets and blue uniforms, and soldiers from the Squadron of The Life Guards who wear white plumed helmets and red uniforms (via Walk London).
Just like in Buckingham Palace's Changing of the Guard, there is also a ceremony that takes place at Horse Guards when guards change shifts. Per the Household Division, the Long Guard, which consists of 10 troopers, one trumpeter, one office, two non-commissioned officers, and a corporal major, is on duty when the monarch is in London. In cases when the monarch is not in London, the security is reduced to the Short Guard, which is comprised of 10 troopers and two non-commissioned officers. The Changing of the Guard ceremony takes place daily at the Horse Guards Parade and the New Guard takes the place of the Old Guard with a royal salute. The ceremony is ideal for tourists and locals who want to have a close look at the pageantry, as there are fewer people and no barricades between the guards and the onlookers, as noted by Changing Guard, unlike at the Changing of Guard at Buckingham Palace, which draws larger crowds.
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