The Royal United Services Institute for Defence and Security Studies (RUSI), officially still known by its old name, the Royal United Services Institution, is a British defence and security think tank. It was founded in 1831 by the Duke of Wellington. RUSI describes itself as "the leading forum in the UK for national and international Defence and Security". It won Prospect Magazine's Think Tank of the Year Award 2008. In 2009, the same magazine named RUSI Foreign Policy Think Tank of the Year. In 2011, RUSI began to celebrate its 180th Anniversary.
More information on the Wikipedia page 
The website is