Elizabeth Military Hospital (which was built on the southwest side of the common where the Shrapnel Barracks had previously stood); it closed in 1995, but was then reopened as a civilian hospital (following the closure of Brook General) in 2006. Large-scale events Plenty of space was available for large-scale military events. As early as 1788 a parade took place on the common at the request of King George III. King William IV inspected the gathered forces of the Royal Artillery and Royal Engineers on the common in 1830, and returned again five years later when 3,000 troops were assembled for a review (involving manoeuvres undertaken by "large bodies of horse, foot and artillery") watched by "an immense assemblage of spectators". Several other royal reviews took place through the nineteenth century, and on into the twentieth, and military displays took place for the benefit of foreign dignitaries and others. In 1919 an open-air service took place on the common to celebrate the signing of the Treaty of Versailles; and a memorial service on the common the following year attracted a crowd of 50,000 people. Later, Royal Artillery "At Home" events took place on the common for members of the public, but in the 1970s these were discontinued because of the IRA terrorist threat. Later developments At the start of the First World War, the common was used as a temporary camp for volunteer units preparing to travel to the front, and as an assembly space for artillery trains. In 1916 the Signals Experimental Establishment moved on to the common (setting itself up in a collection of huts just south of Ha-ha Road) where they worked on early developments in field telephony and inter-aircraft communication; over the next quarter-century the facility was expanded and rebuilt, until the SEE moved to Dorset in 1943. Six years later the Atomic Weapons Research Establishment took over the site, which became a laboratory to develop, test and manufacture components for Britain's first nuclear weapons. In the early 1950s the on-site workforce quickly grew from 155 to 487; the facility was closed in 1964 (its surviving buildings were removed in 2011 to allow the King's Troop RHA to ride out on to the common from their new barracks across the road). In World War II the area was heavily bombed because of the military presence and the existence of an anti-aircraft battery on the common. After the