The Dong Feng 31 (translated literally as "East Wind" (Chinese:东风导弹); a.k.a. CSS-9)'s a long-range, three stage, solid propellant intercontinental ballistic missile in the Dongfeng missile series developed by the People's Republic of China. It's a land-based variant of the submarine launched JL-2. It's operated by the Second Artillery Corps (SAC) which's estimated to have under 15 DF-31 missiles and under 15 DF-31A missiles in inventory.. On August 2, 1999, the Chine… (More on Df-31)