OTR-21 Tochka is a Soviet short-range tactical ballistic missile (SRBM). Its NATO reporting name is SS-21 Scarab. The initial Scarab A entered service with the Soviet Army in 1975. It is transported in a 9P129 vehicle, then erected vertically prior to launch. It uses an inertial guidance system. The OTR-21 began forward deployment to East Germany in 1981, replacing the earlier FROG series of unguided ballistic missiles. Development has continued and at least two improved variants Scarab B and Scarab C have been identified. The SS-21 remains in service with Russia. The Scarab is known to have been operationally deployed during the Second Chechen War, in 1999 and during the n 2008 South Ossetia war.