The Type 03 Medium-Range Surface-to-Air Missile (03式中距離地対空誘導弾), commonly referred to in Japanese as Chū-SAM (中SAM), is a domestically developed air-defence system intended to replace the MIM-23 Hawk, following its replacement requirement issued in 1983. While several NATO nations pursued a common successor to the Hawk and Patriot systems through the MEADS programme, Japan declined participation due to its arms export restrictions. As a result, the JSDF independently initiated the research and development of a domestic SAM system in 1995 to bridge the capability gap between the long-range Patriot and the short-range Type 81. The TADS and TEL units of the Type 03 are based on an MHI/Kato NK-series heavy crane truck chassis, forming the system’s primary radar and launcher components. Despite being the heaviest elements, they remain fully self-propelled, unlike the Hawk. Supporting elements emphasise mobility and networked operation: the command vehicle is based on the Type 73 truck, while relay and fire control vehicles use the HMV platform. Improvements in mobilisation and system integration also reduced the personnel required for a single SAM battery from roughly 50 to about 20 operators.

The Type 03 TEL carries six vertically launched missiles, capable of sustaining up to 36 G during manoeuvring. The missile features a maximum engagement range of approximately 80 km, with target detection and lock-on ranges of up to 50 km, and reaches speeds of around 1,120 m/s. It is Japan’s only operational vertical-launch SAM system, relying on inertial mid-course guidance with radar updates rather than thrust vectoring; as a result, the missile requires additional space after launch to manoeuvre onto its target, particularly against close or fast-moving threats.

The Type 03 Chū-SAM was introduced in Update 2.53 "Line of Contact". Further scaling up from Type 93 to Type 81, it represents Japan’s longest-range mobile SAM system. While its non–thrust-vectoring missile results in a relatively large minimum engagement range of approximately 3–4 km, the Type 03 is otherwise a highly lethal system when operating beyond this limitation.