First production batch of HERO 120 attack drones clears US Army's final quality test before deployment.

On August 4, 2026, prime contractor Mistral Inc. and design authority UVision successfully completed the first Lot Acceptance Tests (LAT) for the HERO 120 loitering munition under the U.S. Army's Lethal Unmanned System (LUS) program. The testing verified that serially manufactured production units consistently satisfy baseline operational specifications and government acceptance criteria prior to formal unit fielding. Demonstrating production-line repeatability allows the Army to issue recurring delivery orders against its $982 million multi-year Indefinite Delivery/Indefinite Quantity (IDIQ) contract framework without repeating prototype qualification cycles.

The Lot Acceptance Testing verified the functional baseline of the 24 kg HERO 120, confirming system compliance across its 60 km operational range, 60-minute airborne endurance, and 4.5 kg warhead payload. Conducted under the Precision Strike Reconnaissance Systems portfolio within Capability Portfolio Executive Mission Autonomy, the successful evaluation enables sustained procurement of munitions, fire-control systems, and support architecture for brigade-level organic fires.

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The completion of the Lot Acceptance Tests (LATs) allows the U.S. Army to officially accept production-standard HERO 120 systems and begin large-scale deliveries to operational units. (Picture source: Army Recognition)

On August 4, 2026, Mistral Inc. and Uvision completed the first Lot Acceptance Tests for the HERO 120 loitering munition under the U.S. Army's Lethal Unmanned System (LUS) program, confirming that production-standard weapons could satisfy Army acceptance criteria before formal delivery. The testing took place within the Capability Portfolio Executive (CPE)'s Mission Autonomy under the Precision Strike Reconnaissance Systems (PSRS) portfolio and required several HERO 120s from the production lot to complete all specified acceptance missions. The U.S. Army was no longer assessing whether the HERO 120 could perform its mission, but whether serially manufactured weapons could reproduce the required configuration and performance with sufficient consistency for government acceptance.

Lot testing therefore examines repeatability across production output, including assembly consistency, software configuration, seeker function, datalink performance, launcher compatibility, and the ability of complete systems to execute the prescribed mission sequence. The milestone follows the October 2025 award of a multi-year Indefinite Delivery/Indefinite Quantity (IDIQ) contract with a ceiling of $982 million covering HERO 120 munitions, launch and fire control equipment, training, sustainment and associated support. Instead of reopening a competition or negotiating a new contract for every batch, the Army can now issue delivery orders against the $982 million ceiling, which is particularly relevant for a weapon that is consumed when used and must therefore be continuously replenished.

The contract scope includes complete munition systems, launch equipment, fire-control units, software, mission planning tools, batteries, spare parts, operator training, maintainer training, logistics support, engineering services and lifecycle sustainment. In practical terms, the US Army is buying an operating architecture rather than only kamikaze drones, because a stockpile of HERO 120 rounds has limited value without sufficient launchers, trained crews, communications equipment, software support and maintenance capacity. Lot Acceptance Testing (LAT) becomes the key quality-control threshold in that acquisition model because repeated delivery orders depend on the production line manufacturing interchangeable rounds to an approved baseline. Once that baseline has been demonstrated, subsequent lots can be checked against the same configuration instead of returning to prototype-level qualification after every order.

The Lethal Unmanned System (LUS) program is intended to give tactical U.S. Army formations a precision-strike option between direct-fire infantry weapons and higher-echelon fires such as artillery, aviation and long-range missiles. The core requirement is for units at brigade, battalion, company and potentially platoon levels to detect, observe and engage targets with an organic weapon rather than automatically transferring every engagement to a supporting artillery battery or aircraft. That substantially shortens the engagement chain because the same tactical element can launch the munition, use its onboard sensor to search the target area, confirm the objective and authorize the strike. Target sets include armored vehicles, fortifications, air defense systems, electronic warfare equipment, command posts, mortar positions, artillery systems, logistics vehicles and personnel.

The LUS program also reflects the U.S. Army's attempt to reduce acquisition time by purchasing mature systems already in production rather than initiating a completely new development cycle. The IDIQ structure allows the US Army to add quantities or potentially introduce new loitering munition variants without replacing the entire contracting framework, making LUS a new procurement architecture for tactical lethal unmanned systems. The HERO 120 itself is a medium-class loitering munition optimized for anti-armor and precision strike missions. Uvision lists the current configuration at 24 kg (complete launch weight), with a warhead of up to 4.5 kg, a range of up to 60 km, and an endurance of 60 minutes.

This gives the kamikaze drone a different employment envelope from a conventional anti-tank missile because the munition can be launched before a final target has been selected, spend time searching or observing, and then engage after identification. Electric propulsion reduces acoustic and thermal signature during flight, while pneumatic launch avoids the rocket plume associated with many missile systems and allows employment from concealed or stand-off positions. The HERO 120 uses a gimballed EO/IR payload for day and thermal imagery, with image processing supporting tracking of moving or stationary targets and terminal guidance. Available lethality packages include anti-tank, anti-personnel, multi-purpose and enhanced-blast warheads, while selectable impact, proximity and delay modes allow the munition to be configured differently for exposed personnel, armored vehicles or structures.

The weapon's most important operational characteristic is that launch does not immediately commit it to one target. A HERO 120 operator can continue searching after launch, maintain surveillance, track a moving target, interrupt an attack, return the munition to loiter, reacquire the original objective, or select another target. This creates a materially different engagement process from an FGM-148 Javelin or conventional indirect fire, where target selection must largely be completed before the weapon is fired and the engagement cannot be recalled once the missile or round is in flight. The HERO 120 maintains man-in-the-loop control through its datalink, with the operator retaining strike authority through the terminal phase.

The system includes encrypted communications using AES-256, GPS-denied mission capability, optional automatic target recognition and AI-assisted tracking, while full-motion video and metadata can be transmitted into tactical networks. Control can also be transferred between users during flight, allowing one unit to launch the drone and another to assume control later in the mission. This can extend tactical reach beyond the physical position of the original firing team and permits a forward unit with better line of sight or more current target information to control the terminal engagement. Moreover, the HERO 120 is not limited to a dismounted launcher and can be installed on vehicles, vessels and helicopters using single or multi-canister launchers. Uvision lists man-portable, vehicle-mounted, maritime and rotary-wing launch options.

Modular Open Systems Architecture (MOSA) compliant interfaces are intended to facilitate integration with third-party command-and-control and ISR systems. Vehicle integration, for instance, allows several ready rounds to be carried by one firing element and permits the launcher and crew to remain protected or positioned farther from the forward edge. The maritime configuration has already been demonstrated with the U.S. Marine Corps Long-Range Unmanned Surface Vessel program. In 2023, a LRUSV was equipped with HERO 120 munitions, and one optionally manned configuration was seen with eight rounds able to engage land or maritime targets up to 60 km from the vessel. Control could be exercised from the accompanying manned vessel or transferred to another Marine equipped with a compatible loitering munition controller if the datalink remained established.

The LRUSV, based on the 40-foot Defiant monohull patrol boat design, was intended to support long-range reconnaissance and precision-fire missions, giving the HERO 120 an additional role for maritime operations in addition to Army ground employment. Mistral Inc. serves as the U.S. prime contractor and systems integrator, with responsibilities covering contracting, integration, the lethality package, program management, logistics and sustainment. Uvision remains the design authority for the HERO 120 and retains responsibility for the weapon's engineering baseline, configuration control, software evolution, manufacturing knowledge and continuity across the broader HERO family. U.S. Army production is conducted domestically, reducing dependence on shipment of complete finished systems from overseas while retaining direct access to the original designer for configuration changes and future upgrades.

That arrangement is particularly important for a munition expected to be purchased over several years because hardware, software, warheads, seekers, datalinks, and fire control equipment must remain compatible from one lot to the next. Production capacity also has direct operational consequences: unlike a reusable reconnaissance UAV, every HERO 120 expended in combat permanently reduces inventory by one round, making sustained manufacturing rate and replacement capacity relevant to unit endurance in a prolonged conflict. For the US Army, the HERO 120 fills a measurable capability gap between ATGMs such as the FGM-148 Javelin and heavier fires controlled above the small-unit level.

The Javelin gives infantry an organic anti-armor capability, but it does not provide a 60 km search radius, one hour of airborne persistence, live EO/IR reconnaissance, or the ability to delay target selection until after launch. Artillery and aviation can deliver greater range and larger warheads, but their availability depends on fire-support coordination, targeting priority, ammunition allocation, and access to assets supporting multiple formations simultaneously. The HERO 120 instead gives a tactical unit an offensive system carrying a 4.5 kg warhead that can remain airborne for 60 minutes while searching tens of kilometers beyond the launch point.

That makes it relevant against targets whose exposure is brief, including mobile air defense vehicles, electronic warfare systems, artillery pieces, command vehicles and logistics elements moving between concealed positions. Completion of the first Lot Acceptance Tests on August 4, 2026, therefore marks the point at which the HERO 120 begins moving from contract award and production qualification toward repeatable Army acceptance and sustained fielding under the LUS program.

Written by Jérôme Brahy

Jérôme Brahy is a defense analyst and documentalist at Army Recognition. He specializes in naval modernization, aviation, drones, armored vehicles, and artillery, with a focus on strategic developments in the United States, China, Ukraine, Russia, Türkiye, and Belgium. His analyses go beyond the facts, providing context, identifying key actors, and explaining why defense news matters on a global scale.

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