The Japan Air Self-Defense Force (JASDF) will begin fielding the ASM-3A supersonic air-to-ship missile on its F-2 fighter aircraft starting in fiscal year 2025, according to official sources and recent disclosures at DSEI Japan 2025.
Developed by Mitsubishi Heavy Industries (MHI), the ASM-3A is an upgraded, extended-range version of the earlier ASM-3 missile, which was originally designed as a high-speed standoff weapon to counter maritime threats.
The ASM-3A variant features an increased range, with estimates placing its reach between 300 and 400 kilometres, compared to the baseline ASM-3’s 200-kilometre range.
In a statement to Janes, a JASDF official said the missile retains its integrated rocket-ramjet propulsion, allowing sustained supersonic speeds and rapid target engagement. The propulsion system uses solid fuel for the initial boost phase, followed by liquid fuel injection into the hollowed rocket chamber to continue combustion as a ramjet.
The JASDF released the missile’s physical specifications: 6 meters in length, 35 cm wing width, and a launch weight of 940 kilograms. It is capable of striking both naval vessels and ground-based targets, broadening its utility in regional contingency planning.
MHI is also developing a further advanced version, the ASM-3 (Kai), which will feature even greater range and improved performance characteristics. The JASDF official did not disclose technical details, but a senior MHI representative at DSEI Japan 2025 confirmed that development is expected to conclude by late 2026.
The shift to ASM-3A comes after Japan reassessed its missile requirements during the initial production phase of the ASM-3. Changes in threat profiles and operational doctrine delayed mass production of the original version. The ASM-3A reflects updated priorities, emphasizing longer standoff range and more flexible engagement profiles.
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