Why THOR Needed a Follow On Weapon

Introduction

Mjolnir mattered because it represented a shift in emphasis. THOR had already demonstrated that a high-power microwave weapon could disable multiple drones rapidly and offer a different approach to countering swarm attacks. The challenge facing the Air Force Research Laboratory (AFRL) was no longer simply proving that microwave effects worked. The next question was whether the technology could become a dependable, repeatable and supportable military capability. Mjolnir was created as the answer to that problem: a follow-on system intended to transform a successful demonstration into something closer to an operational weapon by improving capability, reliability and manufacturing readiness. Air Force Research Laboratory+2Air Force Tech Connect [afrl.af.mil]afrl.af.milrl awards contract for drone killer mjlnir brings new drone hammer to the figAir Force Research LaboratoryAFRL awards contract for drone killer, Mjölnir; brings new…25 Feb 2022 — The Air Force Research Laborator…

The programme therefore reveals an important stage in the maturation of directed-energy weapons. Many defence technologies achieve impressive demonstrations, but far fewer survive the transition into systems that can be built consistently, maintained in service and deployed at scale. Mjolnir was designed to tackle exactly those issues. [Air Force Research Laboratory]afrl.af.milrl awards contract for drone killer mjlnir brings new drone hammer to the figAir Force Research LaboratoryAFRL awards contract for drone killer, Mjölnir; brings new…25 Feb 2022 — The Air Force Research Laborator…

What THOR Proved as a Demonstration System

By the time Mjolnir was announced, THOR had already established the core value proposition of high-power microwave counter-swarm defence. AFRL described THOR as a system capable of defeating multiple drones through microwave energy rather than engaging targets individually. Public demonstrations and programme materials consistently highlighted its ability to affect groups of drones rapidly, an attribute especially attractive against swarm attacks where conventional missiles or guns may become expensive or overwhelmed. Air Force Research Laboratory+2Air Force Research Laboratory [afrl.af.mil]afrl.af.milAir Force Research LaboratoryInformation & Spectrum Warfare - Air Force Research LaboratoryThe Tactical High-power Operational Responder…

The significance of THOR was therefore not that it introduced a new physical principle. Military researchers had long understood that sufficiently intense microwave energy could disrupt electronics. THOR’s achievement was packaging that effect into a transportable counter-drone demonstrator and showing that it could be integrated into realistic base-defence scenarios. AFRL later described large-scale swarm tests as successful demonstrations of the concept. Air Force Research Laboratory+2Air Force Research Laboratory [afrl.af.mil]afrl.af.milAir Force Research LaboratoryInformation & Spectrum Warfare - Air Force Research LaboratoryThe Tactical High-power Operational Responder…

Yet demonstration success creates its own problem. Once military users begin to believe a technology might be useful, attention shifts from laboratory performance to practical questions:

• Can it operate repeatedly without excessive maintenance?

Those questions became the rationale for Mjolnir. [Air Force Research Laboratory+2spacewar.com]afrl.af.milrl awards contract for drone killer mjlnir brings new drone hammer to the figAir Force Research LaboratoryAFRL awards contract for drone killer, Mjölnir; brings new…25 Feb 2022 — The Air Force Research Laborator…

Why Reliability and Manufacturability Became the Next Hurdle

The clearest public explanation of Mjolnir’s purpose came from AFRL itself. When announcing the programme and the award to Leidos, AFRL repeatedly stated that Mjolnir would build upon THOR’s success while introducing advances in capability, reliability and manufacturing readiness. Those three priorities reveal where programme managers believed the remaining risk lay. Air Force Research Laboratory+2Air Force Tech Connect [afrl.af.mil]afrl.af.milrl awards contract for drone killer mjlnir brings new drone hammer to the figAir Force Research LaboratoryAFRL awards contract for drone killer, Mjölnir; brings new…25 Feb 2022 — The Air Force Research Laborator…

Reliability is often an underappreciated challenge in directed-energy programmes. A weapon demonstrated under controlled test conditions may still struggle with component durability, power generation, thermal management, maintenance cycles or operational tempo. A military system must function repeatedly under field conditions and remain available even after extensive use. Public details of THOR’s engineering remain limited, but AFRL’s emphasis on reliability suggests that turning microwave pulses into a dependable operational capability was a major development objective. [Air Force Research Laboratory]afrl.af.milrl awards contract for drone killer mjlnir brings new drone hammer to the figAir Force Research LaboratoryAFRL awards contract for drone killer, Mjölnir; brings new…25 Feb 2022 — The Air Force Research Laborator…

Manufacturing readiness points to a different issue. Demonstrators are frequently assembled using specialised components, bespoke fabrication methods or research-grade hardware. Such approaches can prove a concept but are difficult to reproduce economically and at scale. AFRL’s published material specifically identified manufacturing readiness as a goal for Mjolnir, indicating a desire to move beyond one-off prototypes toward designs that industry could build more systematically. [Air Force Research Laboratory+2spacewar.com]afresearchlab.compronounced “me-YOL-nir”), THOR's “Mighty Hammer.” Mjölnir will have increased range, reliability, and.Read more…

The programme’s structure reinforced this interpretation. In 2022 AFRL awarded Leidos a contract worth roughly $26 million to develop Mjolnir as a next-generation counter-electronics weapon. The choice of an industrial prime contractor reflected the transition from laboratory-led experimentation toward a more formal acquisition and engineering effort. [Defense News+2Air Force Tech Connect]defensenews.comkilling drones with thors hammer air force eyes counter uas mjolnir weaponDefense NewsKilling drones with Thor's hammer: Air Force eyes counter…28 Feb 2022 — The Air Force Research Laboratory said Friday it h…

How Mjolnir Was Intended to Improve on THOR

Although many technical details remain undisclosed, public statements provide clues about the intended evolution.

AFRL documentation described Mjolnir as THOR’s “Mighty Hammer” and stated that it would offer increased range, reliability and manufacturing readiness. Later programme descriptions added capability improvements as another major objective. Air Force Research Laboratory+2Air Force Research Laboratory [afresearchlab.com]afresearchlab.compronounced “me-YOL-nir”), THOR's “Mighty Hammer.” Mjölnir will have increased range, reliability, and.Read more…

Taken together, these goals suggest a progression from a proof-of-concept system toward a more mature weapon:

• Greater range would improve defensive coverage and engagement opportunities. [Air Force Research Laboratory]afresearchlab.compronounced “me-YOL-nir”), THOR's “Mighty Hammer.” Mjölnir will have increased range, reliability, and.Read more…
• Higher reliability would support sustained operations rather than occasional demonstrations. [Air Force Research Laboratory]afrl.af.milrl awards contract for drone killer mjlnir brings new drone hammer to the figAir Force Research LaboratoryAFRL awards contract for drone killer, Mjölnir; brings new…25 Feb 2022 — The Air Force Research Laborator…
• Improved manufacturing readiness would make future production more feasible. [Air Force Research Laboratory]afresearchlab.compronounced “me-YOL-nir”), THOR's “Mighty Hammer.” Mjölnir will have increased range, reliability, and.Read more…
• Enhanced capability implied performance improvements informed by testing and operational experience. [Air Force Research Laboratory]afrl.af.milrl awards contract for drone killer mjlnir brings new drone hammer to the figAir Force Research LaboratoryAFRL awards contract for drone killer, Mjölnir; brings new…25 Feb 2022 — The Air Force Research Laborator…

AFRL officials also indicated that lessons from THOR testing and overseas operational experimentation informed the requirements for Mjolnir. Rather than starting from a blank sheet, the programme sought to convert practical experience into a refined baseline for future systems. [spacewar.com]spacewar.comAFRL awards contract for the Mjolnir anti drone project 999AFRL awards contract for the Mjolnir anti-drone projectMar 1, 2022 — The $26 million Mjolnir prototype, will use the same technology as T…

This pattern is common in military technology development. A first-generation demonstrator identifies what is possible; a follow-on programme identifies what is necessary for real-world use. Mjolnir occupied that second stage.

What Mjolnir Reveals About Maturing Microwave Defence

The most important lesson from Mjolnir is not any specific technical improvement. Instead, it is what the programme reveals about the broader maturity path of high-power microwave weapons.

When AFRL discussed Mjolnir, the language was notably different from the earlier excitement surrounding THOR demonstrations. The focus shifted away from proving that drones could be disabled and toward attributes such as readiness, reliability and production. That change indicates that programme managers regarded the fundamental counter-swarm concept as sufficiently promising to justify investment in engineering refinement. Air Force Research Laboratory+2Air Force Tech Connect [afrl.af.mil]afrl.af.milrl awards contract for drone killer mjlnir brings new drone hammer to the figAir Force Research LaboratoryAFRL awards contract for drone killer, Mjölnir; brings new…25 Feb 2022 — The Air Force Research Laborator…

Mjolnir therefore serves as evidence that microwave counter-swarm defence had progressed beyond the purely experimental stage. Whether or not the eventual system enters large-scale service, the programme shows how directed-energy development typically proceeds:

1. Demonstrate the physical effect.
2. Validate military usefulness in realistic scenarios.
3. Improve reliability and supportability.
4. Prepare designs for repeatable manufacture.
5. Transition toward operational deployment.

THOR largely addressed the first two steps. Mjolnir was created to address the next two. spacewar.com+3Air Force Research Laboratory+3Air Force Research Laboratory [afrl.af.mil]afrl.af.milAir Force Research LaboratoryInformation & Spectrum Warfare - Air Force Research LaboratoryThe Tactical High-power Operational Responder…

For the history of directed-energy weapons, that makes Mjolnir more than a simple successor. It represents the point where a microwave counter-swarm experiment began to be treated as a candidate military capability rather than merely a promising demonstration. Air Force Research Laboratory+2Air Force Tech Connect [afrl.af.mil]afrl.af.milrl awards contract for drone killer mjlnir brings new drone hammer to the figAir Force Research LaboratoryAFRL awards contract for drone killer, Mjölnir; brings new…25 Feb 2022 — The Air Force Research Laborator…

Amazon book picks

Further Reading

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Skunk Works

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Explains how advanced defence technologies move from prototypes to reliable operational systems, mirroring themes behind THOR and Mjolnir.

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The Kill Chain

By Christian Brose

Places emerging counter-drone and advanced weapon technologies within the broader evolution of military capability.

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Drone Wars

By Seth J. Frantzman

First published 2021. Subjects: Military art and science.

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Endnotes

1. Source: spacewar.com
   Title: AFRL awards contract for the Mjolnir anti drone project 999
   Link: https://www.spacewar.com/reports/AFRL_awards_contract_for_the_Mjolnir_anti_drone_project_999.html
   Source snippet

   AFRL awards contract for the Mjolnir anti-drone projectMar 1, 2022 — The $26 million Mjolnir prototype, will use the same technology as T...

2. Source: leidos.com
   Title: how thor hammers enemy drones
   Link: https://www.leidos.com/insights/how-thor-hammers-enemy-drones
   Source snippet

   18 Dec 2019 — A platform that brings down drones using microwave beams. These powerful waves, which travel at the speed of light, are an...

3. Source: leidos.com
   Link: https://www.leidos.com/sites/leidos/files/2020-09/20-196550v2-Counter%20Drone%20Technologies.pdf
   Source snippet

   Counter Drone TechnologiesThe Leidos TIGER HPM source introduces a breakthrough counter-drone capability. This compact, man-portable sour...

4. Source: afrl.af.mil
   Title: rl awards contract for drone killer mjlnir brings new drone hammer to the fig
   Link: https://www.afrl.af.mil/News/Article/2945744/afrl-awards-contract-for-drone-killer-mjlnir-brings-new-drone-hammer-to-the-fig/
   Source snippet

   Air Force Research LaboratoryAFRL awards contract for drone killer, Mjölnir; brings new...25 Feb 2022 — The Air Force Research Laborator...

5. Source: airforcetechconnect.org
   Title: Air Force Tech Connect THOR Hammers [Drone Swarm]({{ ‘swarm-limits/’ | relative_url }}) with High-Power Microwaves
   Link: https://airforcetechconnect.org/news/thor-hammers-drone-swarm-high-power-microwaves
   Source snippet

   THOR Hammers Drone Swarm with High-Power MicrowavesMay 24, 2023 — In 2022, the lab selected Leidos to build Mjolnir, saying the new weapo...

   Published: May 24, 2023

6. Source: afresearchlab.com
   Link: https://afresearchlab.com/wp-content/uploads/2019/09/AFRL_THOR_FS_0122.pdf
   Source snippet

   (pronounced “me-YOL-nir”), THOR's “Mighty Hammer.” Mjölnir will have increased range, reliability, and.Read more...

7. Source: afrl.af.mil
   Link: https://www.afrl.af.mil/tabid/13169/Default.aspx
   Source snippet

   Air Force Research LaboratoryInformation & Spectrum Warfare - Air Force Research LaboratoryThe Tactical High-power Operational Responder...

8. Source: defensenews.com
   Title: killing drones with thors hammer air force eyes counter uas mjolnir weapon
   Link: https://www.defensenews.com/air/2022/02/28/killing-drones-with-thors-hammer-air-force-eyes-counter-uas-mjolnir-weapon/
   Source snippet

   Defense NewsKilling drones with Thor's hammer: Air Force eyes counter...28 Feb 2022 — The Air Force Research Laboratory said Friday it h...

9. Source: airforcetechconnect.org
   Link: https://airforcetechconnect.org/news/under-afrl-contract-leidos-pursue-mjolnir-high-power-microwave-counter-drone-system
   Source snippet

   Under AFRL Contract, Leidos to Pursue 'Mjolnir' High...25 Feb 2022 — The Air Force Research Laboratory's (AFRL) directed energy director...

10. Source: spaceforcetechconnect.org
    Link: https://spaceforcetechconnect.org/news/under-afrl-contract-leidos-pursue-mjolnir-high-power-microwave-counter-drone-system
    Source snippet

    Under AFRL Contract, Leidos to Pursue 'Mjolnir' High...25 Feb 2022 — The Air Force Research Laboratory's (AFRL) directed energy director...

11. Source: afrl.af.mil
    Link: https://www.afrl.af.mil/News/Photos/igphoto/2002944777/
    Source snippet

    awards contract for drone killer, MjölnirAFRL awards contract for drone killer, Mjölnir; brings new drone “hammer” to the fight. An artis...

12. Source: afrl.af.mil
    Title: mil News
    Link: https://www.afrl.af.mil/News/Tag/187/thor/
    Source snippet

    Tag THORAFRL awards contract for drone killer, Mjölnir; brings new drone “hammer” to the fight. KIRTLAND AIR FORCE BASE, N.M. (AFRL) -- T...

13. Source: defensedaily.com
    Title: air force
    Link: https://www.defensedaily.com/under-afrl-contract-leidos-to-pursue-mjolnir-high-power-microwave-counter-drone-system/air-force/
    Source snippet

    Under AFRL Contract, Leidos to Pursue 'Mjolnir' High...25 Feb 2022 — The Air Force Research Laboratory's (AFRL) directed energy director...

Additional References

1. Source: dvidshub.net
   Link: https://www.dvidshub.net/video/904353/afrls-thor-tracks-and-disables-drone-swarm
   Source snippet

   AFRL's THOR Tracks and Disables Drone Swarm"AFRL is also using THOR's success to create a new prototype called Mjolnir, which includes ke...

2. Source: nfaero.com
   Title: dod s national security innovation capital awards 1 5m to new frontier aerospace
   Link: https://www.nfaero.com/post/dod-s-national-security-innovation-capital-awards-1-5m-to-new-frontier-aerospace
   Source snippet

   DoD's National Security Innovation Capital Awards $1.5M to...23 Feb 2023 — The extension is the next step after NFA's successful deliver...

3. Source: airandspaceforces.com
   Title: afrl looking for contractors to build anti uas high powered microwave
   Link: https://www.airandspaceforces.com/afrl-looking-for-contractors-to-build-anti-uas-high-powered-microwave/
   Source snippet

   Air & Space Forces MagazineAFRL Looking for Contractors to Build Anti-UAS High-...30 Jul 2021 — The Air Force Research Laboratory is loo...

4. Source: facebook.com
   Link: https://www.facebook.com/AFResearchLab/posts/for-this-techtuesday-we-look-back-at-the-power-of-thor-and-what-that-means-for-n/3271349919568312/
   Source snippet

   Air Force THOR Drone Killer to Be Joined by "Hammer" Weapon System - Breaking911... AFRL awards contract for drone killer, Mjölnir; brin...

5. Source: army-technology.com
   Title: leonidas high power microwave hpm system usa
   Link: https://www.army-technology.com/projects/leonidas-high-power-microwave-hpm-system-usa/
   Source snippet

   Leonidas High-Power Microwave System, US9 Aug 2024 — Leonidas is a high-power microwave (HPM) technology-based directed energy weapon sys...

6. Source: airandspaceforces.com
   Title: air force testing counter drone weapons
   Link: https://www.airandspaceforces.com/air-force-testing-counter-drone-weapons/
   Source snippet

   Air Force Could Test New Counter-Drone Weapons Next...16 Oct 2025 — On the exhibit floor, Epirus unveiled the latest version of its Leon...

7. Source: epirusinc.com
   Link: https://www.epirusinc.com/electronic-warfare
   Source snippet

   N) semiconductors for unmatched counter-electronics effects...

8. Source: potomacofficersclub.com
   Title: 10 Anti-Drone Weapons Used By The U.S
   Link: https://www.potomacofficersclub.com/articles/10-anti-drone-weapons-us-military/
   Source snippet

   Military24 Oct 2023 — The U.S. Air Force has given a $90 million contract to SRC Inc. to create and provide counter-drone systems for pro...

9. Source: thedefensepost.com
   Title: usaf mjolnir counter drone contract
   Link: https://thedefensepost.com/2022/03/01/usaf-mjolnir-counter-drone-contract/
   Source snippet

   USAF Awards 'Mjölnir' Next-Gen Counter-Drone Contract1 Mar 2022 — The Air Force Research Laboratory has awarded Leidos Inc. a $26 million...

10. Source: x.com
    Link: https://x.com/AirPowerNEW1/status/1845785758038196639
    Source snippet

    FRL #THOR experimentation/demonstration system...