The King's Guard (called the Queen's Guard when the reigning monarch is female) are sentry postings at Buckingham Palace and St James Palace, organised by the British Army's Household Division. The Household Division also mounts sentry postings at Horse Guards, known as the King's Life Guard (called the Queen's Life Guard when the monarch is female). An infantry contingent, typically one of the Household Division's five regiments of foot guards, mounts the King's Guard, while the King's Life Guard is usually provided for by the Household Cavalry Mounted Regiment. Since the 20th century, several other British Army units, Royal Air Force units, Royal Navy units, and military units from other Commonwealth countries have been invited to form the King's Guard. In addition to the King's Guard, the Household Division also provide for several other sentry postings including the Tower of London Guard and the Windsor Castle Guard. Several sentry postings are also occasionally mounted at the Palace of Holyroodhouse, the sovereign's residence in Edinburgh. Although the Household Division considers these other sentry posts as distinct postings from the King's Guard, colloquially, these postings have also been called the "King's Guard" Operating area The King's Guard and King's Life Guard are sentry postings that come under the operating area of the British Army's London District, which is responsible for the administration of the Household Division. The Household Division typically has three infantry battalions posted for public duties; two of these are Guards battalions (one based at Wellington Barracks next to Buckingham Palace and one at Victoria Barracks in Windsor), while the third is a line infantry unit (based at the Royal Artillery Barracks, Woolwich). In addition, there are three incremental companies based at the Royal Artillery Barracks and Wellington Barracks. All of these units come under the administrative authority of the London District — as public duties units, they not only take part in ceremonial but are also committed to providing military aid to the civilian authorities. King's Guards The King's Guard is the name given to the contingent of infantry responsible for guarding Buckingham Palace and St James's Palace (including Clarence House) in London. The guard is made up of a company of soldiers from a single regiment, which is split in two, providing a detachment for Buckingham Palace and a detachment for St James's Palace. Because the Sovereign's official residence is still St James's, the guard commander (called the