There are five different regiments of soldiers serving as the Queen's Guard. The Queen's Guard is responsible for guarding the official royal residences in London, including St James' Palace and the Tower of London.
The Changing of the Guard is a popular event with tourists visiting London. It takes place every day at 11:30 a.m. from April to July and on alternate days for the rest of the year, weather permitting. The ceremony lasts about 45 minutes. During this time, one regiment hands over responsibility for protecting Buckingham Palace and its grounds to another regiment.