US-Japan RDT&E MOU

Intelligence Summary: US-Japan RDT&E Memorandum of Understanding

Node Identity The US-Japan RDT&E MOU is a January 2023 legally-binding Memorandum of Understanding for Research, Development, Test and Evaluation Projects, signed by U.S. Defense Secretary Lloyd Austin and Japanese Defense Minister Yasukazu Hamada. In the Japan intelligence graph, this MOU serves as the foundational bilateral legal framework enabling cooperative directed energy weapons research between the two nations.

Strategic Relevance The RDT&E MOU's strategic significance lies in its role as the enabling legal framework for three priority cooperation areas: (1) hypersonic defense, (2) autonomous systems for fighter teaming, and (3) high-powered microwaves for air defense. The inclusion of 'high-powered microwaves for air defense' alongside hypersonic defense signals that these are viewed as complementary layered defense systems — HPM weapons can disrupt electronic systems of incoming threats at speed-of-light engagement, complementing kinetic interceptors. The MOU was accompanied by a separate Security of Supply Arrangement (SOSA) linking the two nations' defense industrial bases, creating the legal infrastructure for technology transfer and co-production. This MOU directly enabled the subsequent July 2024 HPM Project Arrangement, which operationalized the HPM cooperation into a specific joint research program. The MOU's legally-binding nature distinguishes it from less formal technology-sharing arrangements and reflects the depth of the U.S.-Japan alliance commitment to directed energy weapons co-development. The autonomous systems component also creates potential linkages to AI-enabled targeting for DEW systems.

Technical Focus / Capabilities The MOU covers three technical domains: (1) Hypersonic defense — including the Glide Phase Interceptor (GPI) co-development program targeting hypersonic glide vehicle interception in the 2030s, and space-based infrared sensing for HGV detection; (2) Autonomous systems — focused on fighter teaming concepts where unmanned autonomous aircraft operate alongside manned fighters, with potential DEW integration for self-protection; (3) High-powered microwaves — encompassing phased-array HPM systems using AESA technology to disable UAV swarms and electronics, with joint testing at U.S. test centers. The MOU framework also supports the HTV-X infrared sensor demonstration for space-based HGV tracking, and coordination on LEO satellite constellations for hypersonic detection as announced in the April 2024 US-Japan Joint Statement.

Network Linkage The US-Japan RDT&E MOU maintains 4 documented connections: signatory relationships with JMOD (Japan Ministry of Defense) and U.S. DoD (bidirectional). The MOU serves as the enabling framework for the US-Japan HPM PA (July 2024 Project Arrangement), which operationalizes the HPM cooperation component. JMOD's oversight connects the MOU to ATLA's directed energy weapons programs (HEL, HPM, EMP, railgun). The hypersonic defense component links to the GPI co-development program and Japan's space-based HGV detection efforts. The SOSA companion agreement links U.S. and Japanese defense industrial bases, creating channels for technology transfer between companies like MHI/KHI and their U.S. counterparts.