Four drones had been shot down, and a long-standing promise of the Navy was made the more difficult to ignore. At-sea in 2025, the destroyer USS Preble was demonstrating its High-Energy Laser with Integrated Optical Dazzler and Surveillance (HELIOS) system, incapacitating four aerial targets, a step forward, though incremental, compared to the earlier milestones on single targets.
There has never been any enigma in the attraction of shipboard lasers: the beam is instantly available, the aimpoint can be held at surgical precision and the magazine itself has no real limits except the limits of stowage, but rather the limits of electrical power and cooling potential. Practically it moves close-in defense out of the standard arithmetic of rounds, reloads, and missile canister scores and into the real world of engineering of maintaining fragile optics steady and a high-power system cool on a platform of moving salt water.
HELIOS (also Mk 5 Mod 0) occupies the 60-kilowatt-range and is intended to damage or destroy small airborne and surface threats as well as providing an optical “dazzler” mode to interfere with sensors. It has been installed on Preble since 2022, and is the only ship that has been known to have the entire HELIOS fit, despite several destroyers having since been equipped with ODIN, a less powerful system which is aimed at disrupting the sensors instead of defeating them. Earlier development achievements the Navy recognized have seen HELIOS take down one drone in 2024, which is why the multi-target engagement was a more explicit stress test of what action is required when a ship must re-acquire, re-aim, and hold energy on multiple threats that cannot be stopped to reload.
An unpleasant, brief reality stalks every talk of close-in defence at sea; the conventional interceptors are limited. Even broad-based end-of-range guns and projectiles carry along their own caps – rate of fire, reloading time and mere stock levels. It is one of the reasons why naval commanders continue to seek directed energy as an initial response weapons, and why the authors have suggested directed energy as a response to point defense. The reasoning is strictly functional as it is monetary: spending electricity on the nearest-in threats saves finite amounts of missiles to be used on targets requiring them.
But what lasers cannot still evade is also pointed out by the Preble demonstration, and they are physics and onboard reality. One laser beam is used on a target at a time and the action reduces with the range as the energy diffuses through the atmosphere. Maritime environments also deliver extra punishesments: humidity, salt spray, smoke, and airborne particulates may all have a negative effect on performance, and sensitive optics in the system must be stable to vibration, the sea state and continuous exposure to corrosive conditions. This demands that power be maintained on a critical focus long enough to induce failure, not to create an effect akin to a zapping in the camera, and as such tracking and beam control may be as decisive as pure wattage.
The solution of that control issue in the Navy is more and more toward automation. The investigators at the Naval Postgraduate School have been utilizing AI to accelerate the engagement sequence: classification, pose estimation, aimpoint selection, and aimpoint maintenance, to ensure that operators can oversee, rather than manually control, each step. The code produced massive image collections, a synthetic collection of 100,000 images, and a natural collection of 77,077 images to educate models capable of retaining the laser focused where it is most needed, despite the degradation of the image by a drone performing maneuvers and atmospheric influences (AI to automate the critical components of the tracking system used by laser weapon systems).
Preble is also a point, not a terminus. Navy planning and experimentation has already extended to over 60 kilowatts of substantially higher-power classes that are aimed at harder targets, such as cruise-missile defense. The HELCAP project is based on a Laser Weapon Testbed that is based on a 300+ kW class laser source, and includes an advanced level beam control, adaptive optics and a dedicated prime power and cooling system -an engineering recognition that infinite magazine is only important when the ship has an option to continuously feed and chill the weapon.
Preble, as yet, is the most visible battle in a series of proving grounds on the part of the fleet; of what will be the effect of directed energy no longer the preserve of the laboratory the next time it tries to act as a ship in response to short-range air difficulties. This four-drone engagement did not seal the volume of laser restrictions, however, it did reduce the disparity between demonstration and doctrine.
