 Deployment of the Dongfeng-1 conventionally armed short-range ballistic missile and the Dongfeng-2 (CSS-1) medium-range ballistic missile (MRBM) occurred in the 1960s.The Dongfeng-3 (CCS-2) intermediate-range ballistic missile (IRBM) was successfully tested in 1969.Although the Cultural Revolution disrupted the strategic weapons program less than other scientific and educational sectors in China, there was a slowdown in succeeding years.