Editor: The 2K12 "Kub"(cube in English) is a tracked medium-range surface-to-air missile system, NATO reporting name "Gainful", US Department of Defense designation SA-6. The missile is a two stage, solid-fuel, low-altitude SAM and has radio command guidance with semi-active radar terminal homing. Each battery consists of a 1S91 (SURN vehicle, NATO designation "Straight Flush") 25 kW G/H band radar (range 75 km) equipped with a continuous wave illuminator, in addition to an optical sight. The battery usually also includes four triple-missile transporter erector launchers (TELs) and four trucks each carrying three spare missiles. A battery is able to relocate to an alternate firing position in approximately 15 minutes. Reloading an TEL takes approximately 10 minutes. The TEL is based on a GM-578 chassis, while the 1S91 radar vehicle on a GM-568, all developed and produced by MMZ.