USS Preble’s deployment of the High Energy Laser with Integrated Optical Dazzler and Surveillance, or HELIOS, has become a showcase for how shipboard lasers can neutralize multiple drones while straining existing power systems. Public descriptions vary on whether the system “downed” or “neutralized” four targets, so this article treats the four-drone claim as attributed to specific reports rather than a settled Pentagon fact. The episodes still reveal how directed energy weapons change magazine depth, electrical loads, and future destroyer design.
USS Preble and the four-drone claim
USS Preble, an Arleigh Burke class destroyer, has carried the High Energy Laser with Integrated Optical Dazzler and Surveillance during a series of fleet experiments. Reporting on those trials describes HELIOS engaging multiple unmanned aerial targets, with one detailed account stating that the laser system on a US Navy warship “downs multiple drones” in a controlled scenario, although that language comes from secondary coverage rather than a Department of Defense test report, so the exact number of confirmed kills remains unverified based on available sources.
Other coverage of Preble testing explicitly ties the destroyer to four drone engagements, framing HELIOS as a way to conserve missiles for more advanced threats. A separate account of a 2025 event notes that the Navy used a shipboard laser to neutralize a drone target, again describing a successful demonstration rather than a combat shootdown. Together, these reports support the idea that HELIOS has repeatedly disabled drones from Preble, while the specific claim that it “downed four drones” should be read as the interpretation of individual outlets, not a formal Pentagon tally.
How HELIOS is built and powered
The HELIOS system is described as a modular, fiber based weapon that can scale its output. According to technical summaries, The HELIOS uses multiple kilowatt fiber laser modules that can be expanded to fire at between 60 and 120 kilowatts, which places it in the class of systems intended to defeat small drones and potentially damage cruise missiles. That power level is far higher than earlier demonstrators and immediately raises questions about how much electrical capacity an Arleigh Burke hull can spare without sacrificing propulsion or sensors.
More general descriptions of High Energy Laser emphasize that HELIOS is both a weapon and a sensor, combining its high energy beam with an optical dazzler and surveillance package. That integration means the system is drawing power even when it is not firing, since it supports persistent tracking and non lethal dazzling. For ship designers and combat system engineers, the implication is that future destroyers may need dedicated power modules or integrated electric drive simply to operate lasers at the upper end of the 60 to 120 kilowatt band during sustained engagements.
From single-drone tests to multi-target scenarios
Before the reports linking USS Preble to four drone engagements, the Navy had already used HELIOS in a controlled single target shot. One official account explains that the Navy successfully tested the High Energy Laser with Integrated Optical Dazzler and Surveillance against a drone, confirming that the beam control, tracking, and engagement sequence could work at sea. That early event focused on proving the basic kill chain rather than magazine depth or power management.
Later descriptions of a powerful US Navy laser weapon highlight that the same class of system went on to neutralize multiple drones in a more complex scenario, with one report stating that the laser system downs during a demonstration at sea. That progression from a single target to several unmanned aircraft in one event shows why directed energy is attractive against swarming threats. At the same time, each additional shot draws on the same finite shipboard generators, so multi target success also exposes how quickly high power firing sequences can tax a destroyer’s electrical plant.
Power strain and what comes next for destroyers
Accounts focused on USS Preble’s experience stress that HELIOS did not simply remove drones from the sky, it also exposed a bigger shipboard strain as operators balanced radar loads, hotel services, and propulsion with laser firing. One detailed narrative of the power challenge describes how repeated high energy shots forced careful management of available electrical capacity. That tension between combat performance and power margins is becoming a central design question for future surface combatants.
Broader analysis of HELIOS experiments notes that Lockheed Martin’s High Energy Laser with Integrated Optical and Surveillance package is one of the earliest examples of an operationally relevant shipboard laser. As rivals field systems such as China’s LY 1 high power laser, the experience on Preble suggests that simply bolting a weapon to an existing destroyer is not enough. Navies will have to redesign power generation, distribution, and thermal management if they want lasers that can handle repeated multi drone engagements without forcing crews into constant tradeoffs between propulsion, sensors, and firepower.
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*This article was researched with the help of AI, with human editors creating the final content.
