ASEV (Aegis System Equipped Vessel)

ASEV is Japan's two-ship Aegis surface-combatant program for persistent sea-based ballistic missile defense, with additional air-defense and planned counterstrike capabilities.

Overview

The Aegis System Equipped Vessel is a Japanese naval program intended to replace the cancelled land-based Aegis Ashore deployment. The Japan Maritime Self-Defense Force will operate two ships built around the Aegis combat system and AN/SPY-7(V)1 radar. Japan's Ministry of Defense specifies a hull approximately 190 m long and 25 m wide, with approximately 12,000 tonnes standard displacement and 128 vertical-launch cells, according to Naval News.

The program addresses the fleet burden of continuous ballistic missile-defense patrols. Japan's Ministry of Defense identifies eight existing Aegis destroyers in its missile-defense architecture. Assigning persistent surveillance and interception duties to ASEV is intended to make those destroyers more available for other missions.

ASEV combines that dedicated role with a larger missile magazine and provision for additional weapons. Planned equipment includes SM-3 Block IIA and SM-6 missiles; subsequent additions include counterstrike weapons and the future Glide Phase Interceptor. These are planned capabilities rather than an operational record.

Both ships are under construction. The ministry's commissioning schedule is March 2028 for the first vessel and March 2029 for the second, as reported by Naval News.

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