What is the US Army's surveillance balloon program?
The US Army continues to invest in Persistent Surveillance Systems-Tethered (PSS-T) aerostats—a fleet of large, tethered surveillance balloons designed to monitor large areas for extended periods. Used in conflict zones like Iraq and Afghanistan to detect threats such as roadside bombs, each balloon can remain airborne for over 30 days, operating at altitudes up to 16,000 feet. The Army has committed $447 million for ongoing deployment and support of these systems.
Why are surveillance balloons facing new threats from drones?
Surveillance balloons were once considered a durable, persistent solution for aerial monitoring. However, the rapid evolution and deployment of inexpensive battlefield drones has shifted the threat landscape. Drones, which are affordable and easily deployable, have been used to target large fixed assets—including surveillance systems—on modern battlefields. Recent conflict examples show adversaries using drone swarms to damage or destroy expensive aerial surveillance platforms, undermining their previous security advantages.
How do surveillance balloons compare to drones and satellites for military use?
Balloons offer unmatched endurance and stationary coverage over specific areas, making them valuable for persistent monitoring. However, they are large, relatively immobile, and highly visible, which makes them vulnerable to attack from strike-capable drones or long-range weapons. In contrast, drones and satellites can be distributed, made expendable, and are harder to target consistently. Drones, in particular, can deliver comparable surveillance at a fraction of the cost, and their numbers and flexibility offer tactical advantages in contested environments.
What are the limitations and risks for current buyers and operators?
Buyers considering large aerostat systems for surveillance face notable trade-offs: while the persistent, wide-area visibility is valuable, such systems are increasingly at risk from inexpensive drone attacks. Deployment also comes with high up-front and operational costs, and replacing damaged units is not easy. By contrast, an investment in a diverse fleet of drones or partnerships with satellite providers could offer more flexibility, resilience, and value for many modern missions—especially in areas where aerial assets are likely to be targeted.
The bottom line: Who should consider surveillance balloons today?
Surveillance balloons may still benefit missions that require long-term, unbroken monitoring of fixed areas with limited aerial threat—such as border security or non-combat zones. However, if exposure to drone warfare or guided munitions is likely, decision-makers should weigh the significant vulnerability and replacement costs. For most, diversified aerial surveillance—combining drones, satellites, and ground assets—offers a safer long-term bet as threats and technologies evolve.