
The U.S. State Department has authorized a prospective foreign military sale to Japan, encompassing Joint Air-to-Surface Standoff Missiles with Extended Range (JASSM-ER) and associated equipment, valued at $39 million. The Defense Security Cooperation Agency (DSCA) has officially notified Congress of the transaction’s impending approval.
Japan’s request includes up to sixteen AGM-158B/B-2 JASSM-ER missiles, complemented by critical non-MDE components such as AGM-158 JASSM Dummy Air Training Missiles (DATM), specialized containers, JASSM Anti-jam GPS Receivers (JAGR), and various support systems. Additional provisions include spare parts, consumables, integration and testing tools, software, documentation, training, and logistical support, all of which enhance Japan’s operational readiness.
This sale aligns with U.S. foreign policy objectives and national security priorities by strengthening the defense capabilities of a key Indo-Pacific ally. By equipping the Japan Air Self-Defense Force (JASDF) with advanced long-range strike capabilities, this deal enhances Japan’s ability to counter both current and emerging threats.
The missiles will be integrated into Japan’s advanced fighter platforms, including the F-15J and F-35 variants, enhancing Japan’s strategic defense posture. Notably, the deal is structured to maintain regional military balance, with Lockheed Martin, based in Orlando, Florida, serving as the prime contractor. There are no immediate offset agreements attached to this sale, although future offset negotiations will be conducted directly between Japan and the contractor.
The transaction will not require the deployment of additional U.S. personnel to Japan, facilitating a smooth integration process without increasing U.S. manpower commitments.
The AGM-158B/B-2 JASSM-ER is an upgraded variant of the JASSM, designed for precision strikes against heavily defended targets from extended distances. The missile’s primary purpose is to provide air forces with the capability to strike targets beyond the range of enemy air defenses. Manufactured by Lockheed Martin, the JASSM-ER features an extended range, advanced guidance systems, and an enhanced propulsion system.
With a range exceeding 575 miles (approximately 925 kilometers), the JASSM-ER offers significant operational reach. This extension is made possible by the efficient Williams International F107-WR-105 turbofan engine and structural modifications that improve fuel management. The missile’s guidance system integrates Inertial Navigation System (INS) technology with an anti-jam GPS (JAGR) for improved resistance to electronic interference. The infrared seeker enhances terminal-phase precision targeting, making the JASSM-ER effective against a wide range of targets, including hardened underground facilities, mobile radar installations, and strategic infrastructure.
The JASSM-ER is equipped with a WDU-42/B high-explosive penetrator warhead, designed for maximum effectiveness against reinforced structures. Its stealth characteristics reduce detectability by enemy radars, increasing its ability to penetrate heavily defended airspaces.
Supplementary equipment for the JASSM-ER includes DATM for crew training, transport and storage containers for safe logistics, and spare parts and consumables to ensure long-term missile maintenance.