UNCLASSIFIED // PUBLIC RELEASERELEASE 06 · SEPTEMBER 18, 2026
PENTAGON UFO FILE · DOCUMENT · DOW-UAP-D137AAWSAP DIRD, State of the Art and Evolution of High-Energy Lasers, March 2010
This DIRD from March 2010, part of the AAWSAP series, is a review of directed-energy weapons — specifically, lasers powerful enough to damage targets rather than merely measure range or guide munitions. The release describes a conventional defense-technology survey; it mentions no sightings.
Promise and problems
The paper describes the main families of high-energy laser and the supporting systems a weapon needs: optics, target tracking, beam control and heat management. Their advantages, the author argues, are speed-of-light delivery, precision and limited collateral damage, especially against lightly built or fast-moving targets.
Against that sit long-standing obstacles. Chemical lasers need hazardous fuels; mobile platforms struggle to supply enough electrical power; waste heat has to go somewhere; and the atmosphere fights back through thermal blooming, in which the beam heats the air it passes through, causing that air to defocus the beam.
Context
Lasers were already routine military tools for rangefinding and targeting when the paper was written; the open question was weapon-class power. A related directed-energy paper is Pulsed High-Power Microwave Source Technology, and laser propulsion appears in Laser Lightcraft Nanosatellites.
The official description
From war.gov/UFO, released September 18, 2026, quoted in full
This document is a Defense Intelligence Reference Document (DIRD), a technical reference format used by the Defense Intelligence Agency (DIA) to capture baseline knowledge on a specific topic for later analytic use. DIRDs are best understood as reference and synthesis products rather than as original research. It is one of 38 DIRDs produced under the Advanced Aerospace Weapon System Applications Program (AAWSAP) between 2009 and 2011. Because AAWSAP’s scope permitted a broad range of supporting topics, not every DIRD in the series directly concerns aerospace systems or future threat assessment. The following summary reflects the DIRD’s scope and framing at the time of writing and should not be read as implying current validation of the concepts discussed.
This DIRD surveys the development of high-energy laser weapons and notes that, although lasers had already become important military tools for ranging, guidance, and other lower-power uses, true weapon-class systems remained limited by power generation, beam control, atmospheric propagation, and logistics. The report reviews major laser types along with the optical, tracking, and thermal-management systems needed to make them militarily useful. It argues that high-energy lasers can offer important advantages over kinetic weapons in speed, precision, and low collateral damage, especially against softer or fast-moving targets, while also emphasizing that practical deployment has long been hindered by hazardous chemical fuels, thermal blooming in the atmosphere, power-supply constraints for mobile systems, and waste-heat removal.