The United States State Department has formally approved a proposed foreign military sale to Japan, providing essential equipment and services to bolster Tokyo’s ambitious indigenous hypersonic weapons development program. This estimated $340 million deal marks a crucial step in strengthening Japan’s advanced defense capabilities.
Vital Support Package for the HVGP Program
The announcement, made public on Wednesday via the Foreign Military Sales (FMS) program, covers the provision of unspecified equipment and a wide range of services for Japan’s indigenous Hyper Velocity Gliding Projectiles (HVGP) program. The requested services include critical elements such as test preparation, test and transportation support, range surveillance, range safety including flight termination system reviews, and other related logistics and program support. All equipment and services are set to be provided directly by the US government, underscoring the depth of bilateral cooperation.
This marks the second such request from Japan for US support for its HVGP test program, following an earlier query in March 2025. The Japanese government has already allocated a significant 126.1 billion Japanese yen (approximately $769 million) in its upcoming fiscal year’s defense budget, commencing April 1, dedicated to HVGP development and deployment.
Unveiling the Hyper Velocity Gliding Projectiles (HVGP)
At the heart of this program is the Hyper Velocity Gliding Projectile, a sophisticated boost-glide weapon system. It utilizes a solid-fuel rocket engine booster to propel its warhead payload to a high altitude. Upon separation, the warhead then executes a precise glide maneuver, leveraging its altitude to maintain extreme velocity until impact.
Japan’s Acquisition, Technology and Logistics Agency (ATLA) has been actively testing components, having conducted a pre-launch test of an HVGP in California in March and April 2024 to validate measurement units for future live-fire tests. Furthermore, ATLA showcased the deployment capabilities of the HVGP launch vehicle, an 8×8 wheeled system, during an industry day in November 2025, demonstrating its integration with naval vessels and Japan Air Self-Defense Force (JASDF) C-2 transport aircraft.
Strategic Deployment and Future Prospects
Initial deployment of the HVGP is anticipated for sometime this year, with Mitsubishi Heavy Industries (MHI) selected as the system’s primary manufacturer. According to a document from Japan’s Cabinet Office, the inaugural Block 1 variant is projected to have a range of 500km (310 miles). Ambitious plans are already in motion to extend the HVGP’s reach to an impressive 3,000km around the 2030 timeframe, significantly enhancing Japan’s long-range strike capabilities.
Dual-Track Development: Beyond HVGP
The HVGP is not Japan’s sole foray into hypersonic weaponry. Concurrently, the nation is developing another advanced system, currently known as the Hypersonic Cruise Missile. This variant will be powered by a scramjet engine and, while appearing similar to a conventional missile, will cruise at far greater speeds over extended ranges.
Both Japanese hypersonic systems are being engineered for critical anti-ship and land-attack missions. The anti-ship variant is slated to feature a specialized armor-piercing warhead, designed to breach the decks of aircraft carriers. For land-attack scenarios, the warhead will employ multiple high-density, explosively formed projectiles (EFPs) for wide-area suppression, as detailed in a 2020 ATLA document, underscoring Japan’s comprehensive approach to modernizing its deterrent capabilities in the region.
