Japan has requested up to 150 Standard Missile 6 (SM-6) Block I missiles from the US in a foreign military sale worth $900 million.

The potential sale also includes MK 21 Mod 3 vertical launch system canisters, continued engineering, integration, and test materiel and support for missile production, along with related components, logistics, and technical support.

Japan’s Maritime Self-Defense Force will deploy the RTX-manufactured missiles on its existing and future AEGIS-equipped naval vessels, enhancing the East Asian country’s defense capabilities against increasing regional threats.

“The proposed sale will further enhance Japan’s capability to protect Japan and local allied land forces and will significantly improve Japan’s contribution to integrated air missile defense in the Indo-Pacific region,” the Defense Security Cooperation Agency stated.

The request builds on Tokyo’s $39-million order of Joint Air-to-Surface Standoff Missiles—Extended Range last month.

Multi-Mission Missile

Developed by RTX, the SM-6 was built for the US Navy but is now also deployed by allied naval forces, including Australia, South Korea, and Japan.

Described as “three missiles in one,” the ship-launched weapon is capable of engaging threats on the surface and in the air, including ballistic missiles.

Each missile measures 6.55 meters (21 feet) and features a solid rocket booster and dual-thrust solid rocket motor for propulsion.

Although the SM-6 has a smaller warhead at 64 kilograms (141 pounds) compared to the anti-ship Harpoon missile’s approximately 200-kilogram (440 pounds) warhead, it can reportedly disable large naval vessels instead of sinking them.