The Leonidas high-power microwave (HPM) system, developed by Epirus since 2020, represents a cutting-edge directed energy weapon designed to counter unmanned aerial vehicle (UAV) swarms and other electronic threats. Named after the ancient king Leonidas of Epirus, it uses solid-state gallium nitride (GaN) semiconductors to generate long-pulse microwaves that disrupt electronics, effectively “frying” drone circuits without kinetic munitions. This software-defined technology allows for precise targeting of individual threats or broad-area coverage against swarms, operating safely at low voltages with no ionizing radiation. Key features include modular line-replaceable amplifier modules for quick repairs, an open API for integration with command-and-control systems like FAAD C2, and variants such as ground-based trailers, Stryker vehicle mounts (in partnership with General Dynamics), lightweight pods for drones, and expeditionary models.
The US Army has heavily invested in Leonidas to address asymmetric drone threats observed in conflicts like Ukraine. In January 2023, the Army’s Rapid Capabilities and Critical Technologies Office (RCCTO) awarded Epirus a $66.1 million contract for four Indirect Fire Protection Capability-High-Power Microwave (IFPC-HPM) prototypes, outperforming competitors. Deliveries began in November 2023, with all units completed by May 2024. These Generation I systems were deployed for real-world testing: two to CENTCOM in the Middle East by early 2025, and others to the Indo-Pacific, including Philippine bases in April 2025 amid South China Sea tensions. Feedback from these deployments informed upgrades, leading to a $43.5 million contract in July 2025 for two Generation II systems, enhancing range and cooperative fires capabilities. Testing of these advanced units is slated for October 2025 at Naval Air Weapons Station China Lake, potentially paving the way for a formal Program of Record.
Leonidas offers strategic advantages: cost-effective “pennies per kill” versus expensive missiles, unlimited “magazine” depth, and scalability against evolving threats like autonomous drones or marine vessels. Epirus secured $250 million in funding in March 2025 to scale production, underscoring the Army’s commitment to directed energy for layered air defense. As drone warfare proliferates, Leonidas positions the US Army at the forefront of non-kinetic countermeasures, potentially reshaping battlefield dynamics.
🔴 BREAKING: The U.S. Army now has a weapon that can instantly fry entire drone swarms.
— Defence Index (@Defence_Index) July 14, 2025
It's not a laser.
It's not a missile.
It’s Leonidas — a microwave cannon that sends out a pulse and melts electronics mid-air ⚡
No ammo. No reload. Just pure energy.
One blast = 50+ drones… pic.twitter.com/8vDtRVjjMa