Royal United Services Institute

The Royal United Services Institute for Defence and Security Studies (RUSI) 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 celebrated its 180th Anniversary.
RUSI's Director is Michael Clarke and its President is HRH the Duke of Kent.