U.S. Army evaluates aerostats for counter-drone role

Aerostats, the tethered observation balloons that most people associate with World War II convoy protection, are getting a serious second look from the U.S. Army as a platform for counter-drone defense. One company’s second-generation tactical aerostat is now being evaluated as the foundation for a complete anti-drone architecture that could eventually carry and launch drone swarms of its own.

Silicis Technologies has been developing the DURUS system, a lightweight, mobile tactical aerostat designed to detect and track drones before they can threaten a mission, giving commanders extended warning time and reaction space. The system went through a Technological Readiness Experimentation event at Camp Atterbury in the last year and is now being considered as a base platform for a broader counter-Unmanned Aircraft System complex, according to the company’s description of the program.

DURUS can be towed into position and launched quickly, delivering a 360-degree elevated view of the battlespace and integrating with existing command systems rather than requiring a separate command and control infrastructure.

The case for aerostats in counter-drone operations is straightforward once you stop thinking of them as relics. An aerostat tethered at altitude has persistent presence that no aircraft can match at comparable cost; it stays up as long as the mission requires, doesn’t burn fuel, and doesn’t fatigue a crew. Height translates directly into radar and sensor range, meaning a system like DURUS can see incoming drones at distances that ground-based sensors with the same aperture cannot reach, providing the early warning buffer that is often the difference between a successful intercept and a drone that gets through. The 360-degree coverage eliminates the dead zones that ground-based radar installations create through terrain masking, a persistent problem in the kind of complex environments where counter-drone defense is most needed.

According to Silicis, the DURUS achieved 100 percent fully mission-capable status and flew 97.5 percent of available mission hours during its evaluation, carrying a maximum payload of 45 pounds. The capabilities demonstrated in testing covered communications — including Silvus and Persistent Systems radios — and counter-UAS support through Hood Tech E Trillium camera turrets, McQ Acoustics, AWS ADS-B transceivers, and BlueHalo Titan and SkyView systems. That combination of communications relay and multi-sensor ISR in a single platform reflects the modular architecture Silicis has built into DURUS, which accommodates interchangeable payloads supporting multiple intelligence disciplines, communications extension and relay, MIMO MANET networking, manned-unmanned teaming, counter-small UAS, and intelligence, surveillance, reconnaissance and targeting.

DURUS is sling-load capable and transported on an integrated trailer that carries all primary and backup system components along with a self-contained ground power system, according to the company’s specifications. An aerostat that can only be deployed from a fixed prepared position is a surveillance asset. An aerostat that can be towed behind a vehicle, set up in the field, and launched within a short operational timeline is a tactical counter-drone system that can move with the force it is protecting.

The evolution of the DURUS concept beyond counter-UAS defense into an active offensive capability is where the program becomes genuinely novel. Silicis is developing a variant that transforms DURUS into a mothership capable of carrying and releasing swarms of attack or reconnaissance drones, using the aerostat’s altitude advantage to position a drone group closer to the adversary before launch, and then serving as a communications relay to maintain stable links at extended range as the swarm operates. Launching drones from altitude gives them a range and endurance advantage over ground-launched systems because they start with altitude energy rather than having to climb from the surface, and a tethered relay platform overhead provides persistent communications coverage that drone operations at extended range often lose when flying close to the terrain.

That concept has real-world precedent. Ukrainian company Aerobavovna, which The Defence Blog has previously reported on, has been implementing similar approaches operationally in the war in Ukraine, where aerostat-based drone delivery and relay concepts have moved from theoretical development into field use. Ukraine’s war has repeatedly served as the proving ground for drone warfare concepts that the U.S. military is now evaluating in exercise environments, and the appearance of aerostat-based drone mothership concepts on Ukrainian battlefields gives American military planners a real-world reference point for what the DURUS architecture could deliver if fielded at scale.

The U.S. military’s use of aerostats has been a consistent thread through recent conflicts that rarely receives the attention it deserves. From persistent surveillance platforms over forward operating bases in Afghanistan to airspace monitoring in the Caribbean sensitive region, aerostats have provided capabilities that no other system at comparable cost can replicate. Their return as a counter-drone platform — and potentially as a drone-delivery mothership — reflects a broader truth about military technology: the physics that made aerostats useful in 1944 still apply in 2026, and a platform that puts sensors or weapons at altitude for a long time at low cost will always find a mission.