S.U.N was an organization formed only a few months following the conclusion of the Fourth Shinobi World War, specifically upon the promotion of Kakashi Hatake as the Sixth Hokage. Due to the realization that all major countries had shared intelligence with one another, the Daimyō of each particular country, following some consultation with the Jōnin Council of the respective Shinobi villages underneath their dominion, had come to the conclusion that a shared organization was necessary. While initially S.U.N was simply a coalescence of several researchers of various fields, such as cryptology, medicine, archaeology and the like, the organization was soon brought underneath the rule of Igasaki, supposedly an elite within Sunagakure's ANBU at some point in time underneath a different name.