Last year saw a stark reminder that small unmanned aircraft systems are no longer only a nuisance. The Department of Defense logged more than 350 unauthorized drone flights over roughly 100 military installations in 2024. Those numbers are not just statistics. They represent repeated probes of sensitive airspace that can reveal what our sensors can see and how our defenders respond.

From an engineering and operations perspective the incidents fall into two categories: incidental incursions by hobbyists and commercial operators, and deliberate or sustained activity that looks like surveillance or probing. The distinction matters because the detection signatures, tactics, and required responses differ. Incidental flights tend to be short lived and noisy in telemetry. Sustained or coordinated activity will exploit gaps in detection, flight geographies, and authorities to linger near runways, munitions storage, or force posture displays. Recent public reporting and testimony to Congress indicate a significant share of the 2024 events raised surveillance concerns rather than being simple misjudgments.

Detection is one thing. Attribution and action are another. Sensors can increasingly detect small UAS at low altitude, but detection does not automatically translate into legal or operational authority to disable or seize those systems. As Gen. Gregory Guillot, commander of NORAD and U.S. Northern Command, told lawmakers, roughly half of U.S. bases do not currently have the authorities necessary to aggressively counter hostile small drones. That regulatory gap means base commanders may be able to see a potential threat but lack clear standing to respond with active defeat measures. The result is operational risk multiplied by bureaucratic friction.

Several allied incidents last autumn and early winter underscored how this problem is not unique to one geography. Unexplained or unauthorized UAS activity was reported over US installations in Germany and the United Kingdom, and multiple stateside episodes drew sustained attention. In many of those cases military statements emphasized there was no immediate impact to personnel or assets, but also that investigations could not yet attribute operators or origin points. That uncertainty is exactly what makes these episodes strategically uncomfortable. Adversaries can use ambiguity and the limits of our legal reach to gather intelligence at low cost.

Technologies to detect and to defeat small drones have matured rapidly, but deployment and policy lag remain the bottleneck. There are now commercially available multilayer sensor stacks including RF detection, radar tuned to small RCS targets, electro optical tracking, and acoustic fusion, coupled with kinetic or non-kinetic mitigation options. But many countermeasures are constrained by domestic law, airspace safety rules, and concerns about collateral damage. The technical tradeoffs are clear: kinetic solutions risk collateral harm and airspace contamination, jamming can affect friendly radios and aviation, and capture or intercept systems require precise engagement windows. Those tradeoffs make per-site policy and rules of engagement critical.

Policy levers exist that would materially reduce the kind of ambiguity we saw in 2024. First, clarifying and where appropriate expanding authorities for installation commanders to employ a defined set of counter-UAS tools within clearly delineated perimeters would reduce response time and decision friction. Second, improving data fusion and incident reporting across DoD, DHS, FAA, and state and local partners would help distinguish hobbyist mistakes from persistent foreign surveillance. Third, building rapid deployable detection kits for higher risk sites provides an intermediate step while more permanent infrastructure is fielded. Senior military leaders have been explicit about these needs in congressional testimony.

But policy changes alone will not solve the incentive problem. The economics favor inexpensive unmanned systems for reconnaissance and harassment. A small commercial rotor platform costs a few hundred dollars and can be fitted with cameras or RF sensors. The barrier for an adversary to test a defense posture is therefore low. That means defense planners must prioritize layered, affordable sensing and emphasize rapid attribution techniques that combine sensor data with operator signatures and open source intelligence. Investments in better sensor calibration, automated classification, and adversary profiling will shrink the window between detection and credible attribution.

Finally, there is a role for the commercial and hobbyist community. Better public education on no-fly zones, geofencing updates from manufacturers, and remote ID compliance reduce noise in the detection space. Reducing false positives lets defenders focus scarce resources on genuine threats. Simultaneously, transparency about where and how counter-UAS measures are authorized will reduce public confusion if active defeats are ever employed near populated areas. The balance is delicate but necessary.

The 350-plus incursions in 2024 should be read as a systems warning. It is not just about drones in the sky. It is about sensor coverage, legal authorities, interagency coordination, and the economics of asymmetric probing. Fixing the problem means marrying practical technical deployments with precise policy changes and better public-private information sharing. If we do not, those low-cost aerial platforms will continue to be a persistent probing mechanism for intelligence collection and attempted disruption. We can harden that vulnerability, but doing so requires candid recognition of where capability ends and authority begins, and an honest program to close both gaps.