# The "foo fighters" that trailed World War II aircrews were alien craft or a secret enemy weapon

**No verdict.** What is on the record is not in dispute. From late 1944, Allied aircrews (and, by later accounts, Axis crews too) filed sincere reports of glowing balls of light and colored orbs that seemed to pace or trail their aircraft over Europe and the Pacific. Airmen nicknamed them foo fighters after the "Smokey Stover" comic strip, whose running gag was "where there's foo, there's fire." Both sides investigated at the time and neither found an enemy device. The claim we rate is a different thing: that the lights were extraterrestrial craft or a secret weapon fielded by the other side. That claim is unproven. The leading explanations are natural or physiological, St. Elmo's fire, ball lightning, ice-crystal and searchlight reflections, misperceived planets and stars, and the fatigue of night combat, and no craft or weapon was ever identified. A mundane cause is the likely answer, but the reports are too varied and too poorly instrumented to pin a single explanation to every case, which is why this file rates the exotic claim as unproven rather than debunked.

Category: UFOs & Aliens · Era: 1940s · First circulated: Reports circulated within Allied squadrons from November 1944; the phenomenon reached the public in a Time magazine story on 15 January 1945, and the extraterrestrial reading grew during the postwar UFO wave of the late 1940s and 1950s · Believed by: A durable audience within UFO and aviation-mystery circles, kept alive by the sincerity and training of the original witnesses; the milder "we still cannot fully explain every case" version reaches a broader public
URL: https://theconspiratory.com/theory/foo-fighters-wwii

## Summary
In the last winter of World War II, Allied night-fighter crews began reporting something strange: glowing balls of red, white, or orange light, and sometimes clusters of them, that appeared alongside their aircraft, kept pace through turns and dives, and then vanished. Pilots of the 415th Night Fighter Squadron gave them a name borrowed from a newspaper comic strip, the foo fighters. The reports were numerous, they came from trained observers, and similar accounts later surfaced from the Pacific and, reportedly, from German and Japanese crews. Commanders took them seriously enough to suspect a new enemy weapon, and investigated. This case file keeps two things apart: a real body of sincere sightings that neither side could tie to an enemy device; and the claim it rates, that the lights were alien craft or a secret weapon. On the evidence, the exotic claim is unproven: the mundane explanations, electrical and optical phenomena, misperception, and fatigue, are individually plausible and collectively likely, but the record is too thin to prove which cause applies to which sighting, and no hardware was ever found.

## The claim
That the glowing lights and orbs reported by World War II aircrews were not natural or misperceived phenomena but genuine artifacts under intelligent control, either extraterrestrial craft observing the war or an advanced secret weapon deployed by Germany, Japan, or another power.

## Origin and timeline
- 1944-11: Night-fighter crews flying over the Rhine valley and occupied Europe begin reporting fast-moving glowing objects, often colored red or orange, that appear off the wing, keep station with the aircraft, and then disappear. Early reports come from the 415th Night Fighter Squadron.
- 1944-12: The 415th's intelligence officer compiles a list of separate incidents from December 1944 into early January 1945 and forwards it up the chain to tactical air command. The reports are treated as a possible new German weapon or countermeasure.
- 1944-12: Aircrews adopt the name "foo fighters," taken from Bill Holman's comic strip "Smokey Stover," whose firefighter hero used the nonsense word "foo" and the catchphrase "where there's foo, there's fire." Radar operator Donald J. Meiers is generally credited with the coinage.
- 1945-01-15: Time magazine publishes a short article, "Foo-Fighter," reporting that balls of fire had been trailing American night fighters for over a month and that the crews had named the phenomenon themselves. The story brings the sightings to a wider public.
- 1945: Similar accounts are reported from the Pacific theater, and postwar interviews and histories describe comparable sightings by German and Japanese crews, undercutting the idea that the lights were any single side's secret weapon.
- 1945: Wartime investigation, including work associated with scientific advisers, finds no evidence of an enemy device and leans toward natural or electrical explanations. The war ends without any craft or weapon being recovered or identified.
- 1953-01: The CIA-convened Robertson Panel, reviewing UFO reports for any national-security threat, notes the wartime foo fighter accounts and suggests they were probably electrostatic or electromagnetic phenomena, or reflections from ice crystals, rather than anything under intelligent control.
- 2020: The foo fighters remain a fixture of UFO literature. Later scientific commentary revives natural-plasma and reflection hypotheses, while some researchers argue the surviving reports are simply too varied and too poorly documented to resolve case by case.

## The evidence, claim by claim
- Claim: The lights were an advanced secret weapon fielded by Germany or Japan.
  Evidence: This was the first and most reasonable wartime hypothesis, and it failed on its own terms. If the foo fighters were an enemy device, they did nothing: no aircraft was reported downed or damaged by them, and no weapon, wreckage, or program was ever found after the war, when Allied teams combed captured German and Japanese research in detail. Worse for the theory, German and Japanese crews reportedly saw the same lights, which is not how a secret weapon works. A device that harms no one, is deployed by no one identifiable, and turns up in no captured archive is indistinguishable from no device at all.
- Claim: So many trained pilots could not all be mistaken, so the lights must have been real craft.
  Evidence: The witnesses were sincere and skilled, and something did prompt the reports; that much is granted. But observer skill does not transfer across domains. A night-fighter pilot is expert at flying and fighting, not at judging the distance, size, and motion of an unfamiliar point of light against a black sky, a situation that defeats even trained eyes because there are no reference cues. Volume of reports establishes that a real perceptual phenomenon occurred; it does not establish that the phenomenon was a manufactured craft, and the two are routinely conflated.
- Claim: The lights maneuvered intelligently, pacing aircraft and matching their turns.
  Evidence: Apparent pacing is exactly what optical and electrical phenomena near an aircraft produce. St. Elmo's fire, ice-crystal and searchlight reflections, and reflections of the aircraft's own lights or exhaust move with the aircraft because they are attached to it or to its line of sight, giving an illusion of a following object that matches every maneuver. A distant light such as a bright planet also seems to keep pace because parallax over a moving aircraft is negligible. "It matched my turns" is evidence of a light fixed relative to the observer, not of an object choosing to follow.
- Claim: The lights were extraterrestrial craft observing the war.
  Evidence: There is no positive evidence for this and no way to test it against the record. No foo fighter was photographed clearly, tracked on instruments in a way that survived scrutiny, or recovered. The extraterrestrial reading rests on the gap left by the mundane explanations, the fact that no single natural cause has been proven for every sighting, and treats that gap as room for craft. Absence of a complete conventional explanation is not evidence of an exotic one; it is the ordinary condition of poorly documented wartime sightings.
- Claim: Later scientists showed the lights were an unknown plasma life form or novel physics.
  Evidence: Some modern papers do propose natural plasmas, ionized gas attracted to the electromagnetic environment around aircraft, as a candidate explanation, and popular write-ups sometimes dress this up as a solved mystery or an exotic entity. The sober reading is narrower: plasma and electrical discharge are among several plausible natural mechanisms, offered as hypotheses, not confirmed for specific historical cases. Invoking a still-speculative natural process is a long way from confirming intelligent craft, and does not turn the exotic claim from unproven into proven.

## Why people believe it
- The witnesses were credible and numerous. These were not excitable civilians but combat aircrews filing reports through military channels, and it is genuinely hard to accept that so many trained, sober observers were all simply mistaken, even though unfamiliar lights at night defeat exactly this kind of expertise.
- The wartime context was primed for secret weapons. The Germans really had fielded jets, rockets, and radar-guided marvels, so a strange new aerial phenomenon slotted naturally into a plausible story about the enemy's next surprise, and the initial military suspicion lent the reports early legitimacy.
- The phenomenon crossed sides and theaters. Reports from Europe, the Pacific, and reportedly from Axis crews made the lights feel like a genuine shared mystery rather than one squadron's jitters, which deepened the sense that something real and unexplained was in the sky.
- The postwar UFO wave gave the sightings a new frame. Once flying saucers entered public imagination after 1947, the wartime lights were retrofitted as early alien encounters, and the extraterrestrial reading drew on the same cultural energy that powered the whole saucer era.
- The mystery was never formally closed. Because no single cause was ever proven for every case and no investigation issued a tidy verdict, the sightings kept an open-ended quality, and an unresolved official record is fertile ground for the belief that the real answer was extraordinary.

## Open questions
- No single explanation has been demonstrated for every sighting. St. Elmo's fire, ball lightning, ice-crystal and searchlight reflections, misperceived planets and stars, and fatigue are each plausible for some cases, but the surviving reports are too varied and too poorly instrumented to assign a specific cause to each one.
- The wartime records are incomplete. Intelligence reports were filed, but many accounts survive only as secondhand recollection, so the precise details of speed, size, and behavior in individual sightings often cannot be reconstructed or tested.
- How much combat fatigue, oxygen effects at altitude, and the psychology of night flying contributed is hard to quantify at this distance, and separating genuine external phenomena from perceptual and physiological effects case by case may no longer be possible.

## Sources
- Foo fighter, Wikipedia (2024): https://en.wikipedia.org/wiki/Foo_fighter
- What Were the Mysterious "Foo Fighters" Sighted by WWII Night Flyers?, Smithsonian Magazine (Air & Space) (2016): https://www.smithsonianmag.com/air-space-magazine/what-were-mysterious-foo-fighters-sighted-ww2-night-flyers-180959847/
- Mysterious UFOs Seen by WWII Airmen Still Unexplained, History.com (2019): https://www.history.com/articles/wwii-ufos-allied-airmen-orange-lights-foo-fighters
- The story of American pilots encountering UFOs over Europe during WWII, Task & Purpose (2021): https://taskandpurpose.com/history/foo-fighters-military-world-war-ii/
- UFO Reports and Official Documents 1945 (Foo Fighter files), Project 1947 (1945): https://www.project1947.com/fig/1945a.htm
- Mysteries, Meteors, and Foo Fighters, Skeptic: https://www.skeptic.com/article/mysteries-meteors-and-foo-fighters/
- Foo Fighters and Microwave Oven Plasma Balls, arXiv (C. A. Broka) (2020): https://arxiv.org/abs/2004.10653
- We know what 'foo fighters' that buzzed Second World War pilots really were, say scientists, Yahoo News / The Independent (2023): https://news.yahoo.com/university-experts-reveal-world-war-154506192.html

Rated by The Conspiratory, a neutral, sourced encyclopedia of conspiracy theories. Full page: https://theconspiratory.com/theory/foo-fighters-wwii