(until 1962) RUSI was founded in 1831, making it the oldest defence and security think tank in the world, at the initiative of the
Duke of Wellington. Its original objective was to study naval and military science. The Duke of Wellington spearheaded the establishment of RUSI in a letter to ''Colbourn's United Service Journal
arguing that "a United Service Museum" should be formed, managed entirely by naval and military officers, and under patronage of the monarch, then King George IV, and the commanders-in-chief of the armed forces. Such an institution would prove that the two professions have entered the lists of science, and are ready to contend for honours tam Artibus quam Armis'' ('as much through the arts as through weapons'). Subsequently, Commander Henry Downes, Royal Navy, assembled a group with a view to forming a committee for action, to which King George's First ADC was commanded to convey "His Majesty's gracious and high approbation of the undertaking and of the principles on which it is proposed to conduct it", which were stated to be suitable for "a strictly scientific and professional society, and not a club". The death of the King delayed matters, but the
Duke of Clarence expressed his readiness to become a patron so, encouraged by the powerful support of the Duke of Wellington, the First
Aide-de-camp,
Sir Herbert Taylor, re-submitted the project to
William IV (the former Duke of Clarence), and was able to assure the committee that "it could proceed under his Majesty's gracious auspices". On 25 June 1831 the committee met. The chair was taken by
Major General Sir Howard Douglas, in his person a symbol of the "United Service": a soldier who was the leading expert on naval gunnery. The resolution that the institution be established was put by the future Field Marshal
Viscount Hardinge and seconded by the future
Rear-Admiral Sir Francis Beaufort, the famous hydrographer. The first name adopted was the
Naval and Military Museum: this was altered in 1839 to the
United Service Institution, and in 1860 to the
Royal United Service Institution by a
royal charter of incorporation. In 2004 the name was changed to the
Royal United Services Institute for Defence and Security Studies. Fellows of RUSI may use the five-letter post-nominal abbreviation,
FRUSI.
Premises Prior to moving into its current purpose-built headquarters in 1895, the RUSI began its existence in Whitehall Court, then moved to a house in what was then known as Middle
Scotland Yard in 1832. Queen Victoria granted the RUSI the use of the
Banqueting House, in
Whitehall,
Westminster. It finally moved to its current location next door to the Banqueting House in 1895. As of the end of March 2022, the RUSI has 111 employees in the UK, up from 78 the year prior. In 2025, the institute was declared an
undesirable organization in Russia. == Activities ==