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Within 2023 Test

What THOR's Big Test Still Did Not Prove

The Kirtland demonstration looked important, but missing figures on range, target count and kill rate limit what the public can conclude.

On this page

  • The missing numbers that matter most
  • Why drone type and resilience change the result
  • How controlled range tests differ from combat use
Preview for What THOR's Big Test Still Did Not Prove

Introduction

The April 2023 THOR demonstration at Kirtland Air Force Base was widely presented as a breakthrough for microwave-based counter-drone defence. The Air Force Research Laboratory (AFRL) showed its Tactical High-power Operational Responder engaging a swarm-style attack and declared the event a success. That result mattered because THOR is designed to defeat multiple drones simultaneously rather than one target at a time. Yet the public demonstration left several of the most important operational questions unanswered. AFRL disclosed that THOR engaged “numerous” drones and successfully simulated a swarm attack, but it did not reveal the range of the engagement, the exact number of targets, the percentage disabled, or how the system would perform against more sophisticated threats. As a result, the test demonstrated real progress while leaving key questions about combat effectiveness unresolved. [Air Force Research Laboratory]afrl.af.milThis was the first test of this scale in AFRL history.Read moreAir Force Research LaboratoryAFRL conducts swarm technology demonstrationMay 16, 2023 — 16 May 2023 — AFRL completed a successful demonst…Published: May 16, 2023

Open Questions illustration 1

The Missing Numbers That Matter Most

The most striking limitation of the public record is the absence of quantitative performance data.

AFRL stated that THOR engaged multiple drones during what it described as the largest swarm demonstration in the programme’s history. Public releases repeatedly referred to “numerous” drones and a successful engagement, but they did not disclose how many aircraft were launched, how many were disabled, how many survived, or how many microwave shots were required. [Air Force Research Laboratory+2DSIAC]afrl.af.milThis was the first test of this scale in AFRL history.Read moreAir Force Research LaboratoryAFRL conducts swarm technology demonstrationMay 16, 2023 — 16 May 2023 — AFRL completed a successful demonst…Published: May 16, 2023

Those omissions matter because swarm defence is fundamentally a numbers problem. A system that disables 10 out of 10 drones performs very differently from one that disables 10 out of 20. Without target counts and success rates, outside observers cannot determine whether THOR demonstrated overwhelming effectiveness or merely useful partial effectiveness.

Range is another major unknown. AFRL has long described THOR as a short-range base-defence weapon, but the Kirtland demonstration did not reveal the engagement distance. Public descriptions emphasised high-power microwave pulses, a wide beam and rapid engagement, yet none specified how far from the weapon the drones were when they were affected. [Air Force Research Laboratory+2Facebook]afresearchlab.comcounter swarm high power weaponAir Force Research LaboratoryTACTICAL HIGH POWER OPERATIONAL RESPONDER…Winner of the What's New in Defense 2021 award, THOR is a count…

That missing figure is critical because microwave effects generally weaken with distance. A system that reliably defeats drones at a few hundred metres may face very different challenges when confronting threats arriving from greater stand-off ranges. Without published range data, the practical defensive footprint of THOR remains uncertain. [Air University+2Wikipedia]airuniversity.af.edurls thor hammers drones in new video animationAir UniversityAFRL's THOR hammers drones in new video animation16 Jun 2021 — THOR is a prototype Directed Energy weapon used to disable t…

THOR (Tactical High-power Operational Responder) Destroys Swarms of Enemy Drones

Channel: AFResearchLab

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Why Drone Type and Resilience Change the Result

AFRL highlighted one intriguing detail: the drones used in the 2023 test were types that THOR had not previously encountered. That suggests an effort to avoid simply repeating earlier demonstrations against familiar targets. However, the laboratory did not identify the drones involved or describe their electronic architecture. [Unmanned Airspace+2Popular Science]unmannedairspace.infoUnmanned AirspaceUS Air Force Research Laboratory demonstrates anti-…The US Air Force Research Laboratory (AFRL) conducted a demonstra…

This matters because not all drones are equally vulnerable to high-power microwaves.

Several factors can influence resilience:

  • Electronic shielding and hardening.
  • Wiring layout and component placement.
  • Flight-control redundancy.
  • Resistance to electromagnetic interference.
  • Degree of autonomy after communications loss.

A commercially derived quadcopter may react very differently from a purpose-built military drone designed with electromagnetic protection in mind. Public information from the Kirtland event does not reveal where the tested drones fell on that spectrum. [Unmanned Airspace+2Air & Space Forces Magazine]unmannedairspace.infoUnmanned AirspaceUS Air Force Research Laboratory demonstrates anti-…The US Air Force Research Laboratory (AFRL) conducted a demonstra…

The test also leaves unanswered questions about heterogeneous swarms. Real-world attacks may combine different drone sizes, flight profiles and electronics in the same formation. A microwave system might perform exceptionally well against one class of target while achieving more mixed results against another. The public demonstration does not provide enough information to judge THOR’s effectiveness against that kind of diversity. [ndupress.ndu.edu]ndupress.ndu.educountering swarms strategic considerations and opportunities in drone warfareStrategic Considerations and Opportunities in Drone Warfare24 Oct 2022 — This article addresses ways to prepare for and respond to this l…

Open Questions illustration 2

How Controlled Range Tests Differ From Combat Use

AFRL described the event as a simulation of a real-world swarm attack, but a controlled test range remains fundamentally different from operational combat conditions. [Air Force Research Laboratory]afrl.af.milThis was the first test of this scale in AFRL history.Read moreAir Force Research LaboratoryAFRL conducts swarm technology demonstrationMay 16, 2023 — 16 May 2023 — AFRL completed a successful demonst…Published: May 16, 2023

The demonstration does not answer several practical questions:

  • How well THOR performs in adverse weather.
  • Whether terrain or structures reduce effectiveness.
  • How the system copes with multiple attack axes simultaneously.
  • Whether electronic countermeasures affect performance.
  • How rapidly it can handle repeated waves of drones.

Range testing is valuable because variables can be measured and controlled. Combat environments introduce uncertainty, clutter, unexpected flight behaviour and competing demands on operators. A successful demonstration proves a capability exists; it does not automatically prove that capability will perform identically in a contested operational environment. [ndupress.ndu.edu]ndupress.ndu.educountering swarms strategic considerations and opportunities in drone warfareStrategic Considerations and Opportunities in Drone Warfare24 Oct 2022 — This article addresses ways to prepare for and respond to this l…

Another unresolved issue is sustainment. Public reports praised THOR’s ability to engage multiple targets quickly, but the demonstration did not reveal long-duration operating limits, power demands during extended engagements or maintenance requirements between repeated swarm attacks. [Unmanned Systems Technology]unmannedsystemstechnology.comUnmanned Systems TechnologyAFRL Conducts Swarm Technology Demonstration | UST“THOR was exceptionally effective at disabling the swarm wit…

The US Army's new answer to drone swarms: LEONIDAS

Channel: Sandboxx

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America’s “THOR” Shoots Drones With High-power Microwaves | Has US Found the Answer to Drone Swarms?

Channel: CRUX

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The Difference Between “Worked” and “Ready”

The Kirtland demonstration established something important: THOR was able to engage a swarm-style target set and disable multiple drones using high-power microwave energy. For a technology intended to counter massed unmanned aircraft, that was a meaningful achievement. Air Force Research Laboratory+2Air & Space Forces Magazine [afrl.af.mil]afrl.af.milThis was the first test of this scale in AFRL history.Read moreAir Force Research LaboratoryAFRL conducts swarm technology demonstrationMay 16, 2023 — 16 May 2023 — AFRL completed a successful demonst…Published: May 16, 2023

What it did not establish was equally important. The public record still lacks the key metrics needed to assess operational effectiveness: engagement range, target count, kill rate, performance against hardened drones, behaviour under combat conditions and endurance during sustained attacks. Even subsequent discussions of THOR within Air Force acquisition circles continued to describe the system as a promising capability moving toward greater maturity rather than a fully proven operational solution. [Air & Space Forces Magazine]airandspaceforces.comAir & Space Forces Magazine USAF Needs More Money to Stop Drone SwarmsAir & Space Forces MagazineUSAF Needs More Money to Stop Drone SwarmsAugust 10, 2023 — 10 Aug 2023 — Air Force acquisition official Steve…Published: August 10, 2023

For that reason, the 2023 Kirtland event is best understood as evidence that the underlying concept works, not proof that every major challenge of countering drone swarms has been solved. The demonstration answered whether THOR could engage a swarm. It left open the harder question of how reliably it could do so when the numbers, distances and adversary sophistication begin to increase. Air Force Research Laboratory+2Air & Space Forces Magazine [afrl.af.mil]afrl.af.milThis was the first test of this scale in AFRL history.Read moreAir Force Research LaboratoryAFRL conducts swarm technology demonstrationMay 16, 2023 — 16 May 2023 — AFRL completed a successful demonst…Published: May 16, 2023

Open Questions illustration 3

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Endnotes

  1. Source: facebook.com
    Title: the next afrltech air warfare symposium 2022 feature is thor tactical high power
    Link: https://www.facebook.com/AFResearchLab/posts/the-next-afrltech-air-warfare-symposium-2022-feature-is-thor-tactical-high-power/317631193725485/
    Source snippet

    The next #AFRLTech Air Warfare Symposium 2022 feature...A high-power microwave counter-drone system, the containerized THOR is designed...

  2. Source: Wikipedia
    Title: Rapid Destroyer
    Link: https://en.wikipedia.org/wiki/RapidDestroyer

  3. Source: ndupress.ndu.edu
    Title: countering swarms strategic considerations and opportunities in drone warfare
    Link: https://ndupress.ndu.edu/Media/News/News-Article-View/Article/3197193/countering-swarms-strategic-considerations-and-opportunities-in-drone-warfare/
    Source snippet

    Strategic Considerations and Opportunities in Drone Warfare24 Oct 2022 — This article addresses ways to prepare for and respond to this l...

  4. Source: facebook.com
    Title: us army receives four prototype units that disabled 61 drones in field tests usi
    Link: https://www.facebook.com/AUSA.org/posts/us-army-receives-four-prototype-units-that-disabled-61-drones-in-field-tests-usi/1391633689657875/
    Source snippet

    Army receives four prototype units that disabled 61...In the test, the system knocked 49 out of 61 drones out of the sky using a targete...

  5. Source: facebook.com
    Title: the coordinated [drone swarm]({{ ‘swarm-limits/’ | relative_url }})
    Link: https://www.facebook.com/themilitarychannelusa/photos/read-in-the-rapidly-evolving-landscape-of-2026-where-disposable-air-forces-and-d/122197190978902462/
    Source snippet

    While a laser is like a sniper...26 Mar 2026 — In a landmark April 2023 demonstration at Kirtland Air Force Base, THOR successfully "cle...

    Published: April 2023

  6. Source: afrl.af.mil
    Title: This was the first test of this scale in AFRL history.Read more
    Link: https://www.afrl.af.mil/News/Article-Display/Article/3396995/afrl-conducts-swarm-technology-demonstration/
    Source snippet

    Air Force Research LaboratoryAFRL conducts swarm technology demonstrationMay 16, 2023 — 16 May 2023 — AFRL completed a successful demonst...

    Published: May 16, 2023

  7. Source: airandspaceforces.com
    Title: air forces thor drone swarm demo
    Link: https://www.airandspaceforces.com/air-forces-thor-drone-swarm-demo/
    Source snippet

    This was the first test of this scale in AFRL history.Read more...

  8. Source: dsiac.dtic.mil
    Title: DSIACAFRL Conducts Swarm Technology Demonstration
    Link: https://dsiac.dtic.mil/articles/afrl-conducts-swarm-technology-demonstration/
    Source snippet

    Conducts Swarm Technology Demonstration - DSIAC16 May 2023 — AFRL, conducted a demonstration, April 5, 2023, of its high-power microwave...

    Published: April 5, 2023

  9. Source: afresearchlab.com
    Title: counter swarm high power weapon
    Link: https://afresearchlab.com/counter-swarm-high-power-weapon/
    Source snippet

    Air Force Research LaboratoryTACTICAL HIGH POWER OPERATIONAL RESPONDER...Winner of the What's New in Defense 2021 award, THOR is a count...

  10. Source: airuniversity.af.edu
    Title: rls thor hammers drones in new video animation
    Link: https://www.airuniversity.af.edu/News/Display/Article/2658386/afrls-thor-hammers-drones-in-new-video-animation/
    Source snippet

    Air UniversityAFRL's THOR hammers drones in new video animation16 Jun 2021 — THOR is a prototype Directed Energy weapon used to disable t...

  11. Source: unmannedairspace.info
    Link: https://www.unmannedairspace.info/counter-uas-systems-and-policies/us-air-force-research-laboratory-demonstrates-anti-drone-swarm-c-uas-technology/
    Source snippet

    Unmanned AirspaceUS Air Force Research Laboratory demonstrates anti-...The US Air Force Research Laboratory (AFRL) conducted a demonstra...

  12. Source: popsci.com
    Title: thor weapon drone swarm test
    Link: https://www.popsci.com/technology/thor-weapon-drone-swarm-test/
    Source snippet

    Popular ScienceAir Force uses THOR's energy to zap drones23 May 2023 — Employing a weapon called THOR, the Air Force used microwave energ...

    Published: May 2023

  13. Source: unmannedsystemstechnology.com
    Link: https://www.unmannedsystemstechnology.com/2023/05/afrl-conducts-swarm-technology-demonstration/
    Source snippet

    Unmanned Systems TechnologyAFRL Conducts Swarm Technology Demonstration | UST“THOR was exceptionally effective at disabling the swarm wit...

  14. Source: airandspaceforces.com
    Title: Air & Space Forces Magazine USAF Needs More Money to Stop Drone Swarms
    Link: https://www.airandspaceforces.com/air-force-official-acquisition-funds-counter-drone-swarm/
    Source snippet

    Air & Space Forces MagazineUSAF Needs More Money to Stop Drone SwarmsAugust 10, 2023 — 10 Aug 2023 — Air Force acquisition official Steve...

    Published: August 10, 2023

  15. Source: afrl.af.mil
    Link: https://www.afrl.af.mil/News/Video/?dvpTag=Thor&dvpmoduleid=69743
    Source snippet

    Force Research Laboratory VideoTactical, High-power, Operational Responder, known as THOR, is a high-power microwave counter-drone weapon...

  16. Source: afrl.af.mil
    Title: mil Tactical High-power Operational Responder
    Link: https://www.afrl.af.mil/News/Photos/igphoto/2003223867/
    Source snippet

    High-power Operational Responder... April 5, 2023. AFRL completed a successful demonstration of THOR simulating a real-world swarm attack...

    Published: April 5, 2023

Additional References

  1. Source: techbriefs.com
    Link: https://www.techbriefs.com/component/content/article/49907-meet-thor-afrls-counter-drone-that-tracks-and-disables-drone-swarm
    Source snippet

    Meet THOR: AFRL's Counter-Drone that Tracks and...THOR is a high-power microwave counter-drone weapon that the Air Force Research Lab ha...

  2. Source: youtube.com
    Link: https://www.youtube.com/watch?v=QjHGxKb6W1c
    Source snippet

    THOR (Tactical High-power Operational Responder) Destroys...AFRL's THOR (Tactical High-power Operational Responder) is a prototype Direc...

  3. Source: realcleardefense.com
    Title: thor hammers drone swarm with high power microwaves 900839
    Link: https://www.realcleardefense.com/2023/05/22/thor_hammers_drone_swarm_with_high-power_microwaves_900839.html
    Source snippet

    THOR Hammers Drone Swarm with High-Power Microwaves22 May 2023 — An experimental directed energy weapon developed by the Air Force Resear...

    Published: May 2023

  4. Source: airforce-technology.com
    Title: thor defeats swarm with energy weapon
    Link: https://www.airforce-technology.com/news/thor-defeats-swarm-with-energy-weapon/
    Source snippet

    17 May 2023 — THOR was tested against a swarm of drones for the first time and was successful in defeating them with a high energy direct...

    Published: May 2023

  5. Source: youtube.com
    Link: http://www.youtube.com/watch?v=r8SYbFQGr-Y
    Source snippet

    The US Army's new answer to drone swarms: LEONIDAS...

  6. Source: airforcetechconnect.org
    Link: https://airforcetechconnect.org/news/thor-hammers-drone-swarm-high-power-microwaves
    Source snippet

    Air Force Tech ConnectTHOR Hammers Drone Swarm with High-Power Microwaves24 May 2023 — THOR uses bursts of high-power microwave energy to...

    Published: May 2023

  7. Source: youtube.com
    Title: THOR tested
    Link: http://www.youtube.com/watch?v=hljlP4qsbak
    Source snippet

    America’s “THOR” Shoots Drones With High-power Microwaves | Has US Found the Answer to Drone Swarms?...

  8. Source: taskandpurpose.com
    Title: air force thor directed energy drone swarm test
    Link: https://taskandpurpose.com/tech-tactics/air-force-thor-directed-energy-drone-swarm-test/
    Source snippet

    This was the first test of this scale in AFRL history.Read more...

  9. Source: youtube.com
    Title: The US Army’s new answer to drone swarms: LEONIDAS
    Link: http://www.youtube.com/watch?v=GSETxYGrxVw
    Source snippet

    THOR (Tactical High-power Operational Responder) Destroys Swarms of Enemy Drones...

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