is a Soviet short-range tactical ballistic missile. Its GRAU designation is 9K79; its NATO reporting name is SS-21 Scarab. It is transported in a 9P129 vehicle, then erected vertically prior to launch. It uses an inertial guidance system. The OTR-21 forward deployment to GDR began in 1981, replacing the earlier FROG series of unguided ballistic missiles.
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