Development of the 9K37 "Buk" started on 17 January 1972 at the request of the Central Committee of the CPSU. In addition to the land-based system, a marine system was to be produced for the Navy: the 3S90 "Uragan" (hurricane) which also carries the SA-N-7 and "Gadfly" designations. The modernized version of the 3S90 is the 9K37M1-2 (or 9K317E) "Ezh", which carries the NATO reporting name "Grizzly" or SA-N-12 and the export designation "Shtil". It uses the new 9M317 missile.
