DF-21D

China's original "carrier killer" — a road-mobile, medium-range ballistic missile with a maneuverable reentry vehicle, purpose-built to deny access to large warships by holding them at risk far from the Chinese coast.

Overview

The DF-21D (Dong Feng-21D, NATO designation CSS-5 Mod 5) is the world’s first operational anti-ship ballistic missile (ASBM) — a conventional, solid-fuel, two-stage road-mobile missile that uses a terminal maneuvering reentry vehicle (MaRV) to strike moving surface ships at ranges of roughly 1,450–1,550 km. Entering service around 2006, it became the signature component of China’s anti-access/area-denial (A2/AD) posture, explicitly intended to push U.S. aircraft carrier strike groups out of striking range of the Chinese mainland. Its existence compelled Western navies to invest heavily in distributed operations, long-range anti-ship weapons, and layered missile defense.

Development

The DF-21D stems from the broader DF-21 solid-fuel ballistic missile family, whose origins trace to the late 1960s when China first transitioned from liquid-fueled designs. The baseline DF-21 first flew in 1985 and achieved service in 1991, followed by improved nuclear (DF-21A), conventional land-attack (DF-21C), and further nuclear (DF-21E) variants, according to CSIS Missile Threat and Wikipedia. The anti-ship “D” model emerged from a parallel effort to mate the proven two-stage airframe with a biconic, finned MaRV and a terminal seeker capable of discriminating a moving target at sea; the concept likely underwent first flight tests around 2005–06. CSIS assesses the DF-21D entered service about 2006, and the U.S. Department of Defense judged an early operational capability to have been reached by 2010. The missile was first shown publicly during a 3 September 2015 military parade.

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