The S-75, also known as the NATO reporting name SA-2 Guideline, is a Soviet-designed surface-to-air missile system developed in the 1950s. It was primarily used to target high-altitude aircraft and played a significant role during the Vietnam War, where it was employed by North Vietnamese forces against American bombers. The S-75 system consists of a radar for target detection and tracking, along with mobile launchers for the missiles. Its effectiveness in combat led to the development of various upgraded versions, and it has been used by numerous countries around the world, showcasing its enduring legacy in air defense technology.