US, Japan reach agreements for AMRAAM assembly, SM-3 production boost: Japanese MoD

The United States and Japan agreed to expand missile-production cooperation under Operation Supercharge. Japan will host a facility for the final assembly and inspection of AMRAAM, an air-defense missile used by aircraft and ground-based launchers. The agreement is intended to improve access to weapons and strengthen Japan’s defense industry.

The countries also agreed to share technical information needed to increase production of the Standard Missile-3 Block IIA. Unlike AMRAAM, the SM-3 Block IIA is primarily ship-based and intercepts ballistic missiles. Both agreements connect industrial capacity with military readiness.

Important details remain unsettled. Japan’s industry partner has not been announced, and neither the facility’s opening date nor its expected output is known. Koizumi also gave no estimate for how much SM-3 production could rise. The Pentagon confirmed broader coordination on critical munitions, but its public meeting readout did not mention either agreement.

AMRAAM, made by Raytheon, is the Advanced Medium-Range Air-to-Air Missile. It is a key air-defense weapon, meaning it helps defend against airborne threats. The missile matters especially to the F-35 Joint Strike Fighter, which Japan and the United States operate alongside other international partners.

AMRAAM can be launched in two ways described in the article. Aircraft can fire it during air operations, while ground-based launchers can use it as part of an air-defense system. This gives the weapon different deployment options, linking fighter operations with defenses based on land.

The missile is currently in high demand because of conflicts in Ukraine and the Middle East. Raytheon is under a large new production contract, and the Pentagon said output could nearly double if lawmakers provide funding. Japan’s planned assembly and inspection facility is meant to support access and industrial capacity.

Under a September contract worth up to more than $20 billion, AMRAAM production is expected to nearly double. The agreement covers five years, with options for two additional years. This is a major planned increase for a missile already in high demand.

The contract was awarded to Raytheon, an RTX subsidiary. Its purpose is to expand manufacturing of AMRAAM, which can be fired by aircraft and ground-based launchers. The Pentagon described the projected increase as nearly doubling the weapon’s production, rather than providing a precise number of additional missiles.

The expansion is not automatic. The Pentagon said it depends on US lawmakers supplying the necessary funding. The article also does not state the present production rate or the future number of missiles. Japan’s planned assembly facility is separate from this US contract, and its opening date and output remain unknown.

The United States and Japan are pursuing more missile production because AMRAAM is in high demand amid conflicts in Ukraine and the Middle East. Military planners are focused on increasing output during a broader crunch for munitions. Reliable supplies matter because AMRAAM supports air defense and is described as essential for F-35 fighters.

Japan will establish a final assembly and inspection facility for AMRAAM. The article does not identify the Japanese company that will operate it. Adding this capability could give the two countries another production location and help Japan build more expertise in defense manufacturing. Koizumi said the agreement would strengthen Japan’s defense industry base.

The facility’s schedule and expected output are still unknown. The wider US contract could nearly double AMRAAM production, but only if Congress provides funding. The agreements also reflect deeper US-Japan defense cooperation as Japan increases defense spending and both governments respond to a worsening regional security situation.

The Standard Missile-3 Block IIA is an interceptor used primarily from ships to bat down ballistic missiles. The United States and Japan operate it as a joint program. Its role is missile defense against ballistic missiles, rather than the air-defense role associated with AMRAAM.

The two weapons also differ in how they are launched and what they target. AMRAAM can be fired by aircraft and ground-based launchers, and it is essential for F-35 fighters. The SM-3 Block IIA is described as primarily ship-based and is designed to intercept ballistic missiles. The article does not provide further technical specifications.

The countries agreed to share technical information to achieve increased SM-3 production. Koizumi did not say how much output might rise. Separately, Japan will establish an AMRAAM final assembly and inspection facility, but its partner, opening date, and expected production remain undisclosed.

Raytheon, an RTX subsidiary, manufactures AMRAAM. The United States and Japan have agreed that final assembly and inspection will also take place at a facility in Japan. The Japanese company selected for that work has not been identified. This arrangement links the missile maker with a new local industrial capability.

The governments provide the framework for cooperation. They negotiated the AMRAAM assembly agreement and agreed to share technical information for higher SM-3 Block IIA production. The United States also awarded Raytheon a contract worth up to more than $20 billion over five years, with options for two more years. US lawmakers must provide funding for the planned production increase.

Japan’s facility has no announced opening date or output target. The article does not describe a specific Japanese role in manufacturing SM-3 components. It does say both countries are coordinating on critical munitions and using Operation Supercharge to deepen defense-technology cooperation.

Deterrence depends partly on convincing a potential adversary that aggression will be difficult to carry out. Missile production supports that goal by helping countries maintain the weapons needed for defense. Missile defense adds another layer by attempting to stop incoming threats. Alliances make these capabilities more powerful when partners coordinate their resources and plans.

The article connects these ideas directly to the US-Japan alliance. AMRAAM can support aircraft and ground-based air defense, while SM-3 Block IIA intercepts ballistic missiles from primarily ship-based platforms. Producing more of both weapons can help sustain military readiness. Sharing technical information can also improve cooperation between the two countries.

The agreements are part of Operation Supercharge and come as Japan raises defense spending and regional concerns intensify. Koizumi and Hegseth agreed to strengthen the alliance’s deterrence and response capabilities faster. Still, the scale of the result remains uncertain because funding, facility timing, and production figures are not fully settled.