The SA-6 Gainful is a Soviet-designed surface-to-air missile system, officially known as the 9K37 Buk. It was developed in the 1960s to provide air defense against various aerial threats, including aircraft and missiles. The system is mobile, allowing it to be deployed quickly in different locations, and it can engage multiple targets simultaneously. The SA-6 Gainful features a radar-guided missile with a range of approximately 30 kilometers. It is typically operated by a crew of three and includes components such as a command vehicle, radar units, and missile launchers. The system has been widely exported and used by several countries around the world.