The Dong Feng 15 (also known as M-9, CSS-6) is a short-range ballistic missile (SRBM) developed by the People\'s Republic of China. It is the only non-nuclear missile being used by the People\'s Liberation Army (PLA) Second Artillery Corps.Development of the DF-15 began in 1985 with a finalized design proposal being approved by the PLA in 1987. For at least two years afterward, testing of the missile was done in the Gobi Desert. The first public display of the missile took place at the Beijing Defense Exposition in 1988. Some sources suggest a small number of the DF-15 missiles were deployed in 1989.