DF-17

China's road-mobile DF-17 marries a medium-range ballistic missile booster to the DF-ZF hypersonic glide vehicle — a maneuvering, low-altitude payload built to outwit missile defenses and hit fixed high-value targets at 1,800–2,500 km.

Overview

The DF-17 (Dong Feng-17), assigned the US designation CH-SS-22, is a road-mobile medium-range ballistic missile system fielded by the People's Liberation Army Rocket Force. Its distinguishing feature is the DF-ZF hypersonic glide vehicle (HGV) — a wedge-shaped, maneuvering payload that separates from the ballistic booster after ascent and glides through the upper atmosphere at speeds assessed between Mach 5 and Mach 10. The combination is designed to defeat layered missile defenses by flying a depressed, non-ballistic trajectory that evades mid-course intercept and compresses terminal warning times. The DF-17 entered operational service by 2019 and remains the only operationally fielded HGV system acknowledged by any nuclear-weapon state, according to CSIS Missile Threat.

Development

The DF-ZF glide vehicle emerged from a PLA program tracked by US intelligence under the early designator Wu-14. Testing began at the Taiyuan Satellite Launch Center, with the first flight recorded in January 2014. At least nine flight tests were conducted between January 2014 and November 2017, during which US officials observed what they described as "extreme maneuvers," per CSIS Missile Threat. The developmental pace — roughly two tests per year — indicated a focused, well-resourced effort to move the HGV from experiment to operational system. The DF-17 made its public debut at the 1 October 2019 National Day parade in Beijing, where 16 transporter-erector-launchers carrying the missile rolled past Tiananmen Square, signaling initial operational capability. US intelligence assessments through the Defense Intelligence Agency subsequently confirmed that the system had been fielded with the PLA Rocket Force and was assessed as a conventional precision-strike capability with potential nuclear applications, as analyzed by the Washington Times.

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