High Quality Content by WIKIPEDIA articles! The Bristol Bloodhound is a British surface-to-air missile developed during the 1950s as the UK`s main air defence weapon, and was in large-scale service with the Royal Air Force (RAF) and the forces of four other countries. The Bloodhound Mk. I entered service in December 1958 and the last Mk. II missile squadron stood down in July 1991, although Swiss examples remained operational until 1999.