The Scientific Pursuit of Green Fireballs: Early UAP Investigations in the DOE and FBI Files
A recently analyzed set of declassified files reveals a fascinating chapter in early military investigations of unidentified aerial phenomena. Documented within a Sandia Base library file and FBI archives, these records detail how scientists and federal agents attempted to understand the "green fireballs" and "flying discs" penetrating American airspace. Rather than relying solely on standard Air Force archives, these cross-agency documents show the lengths to which the government went to capture physical evidence of these elusive objects.
The Scientific Pursuit of the Green Fireballs
The core of this historical intersection is a series of reports detailing the scientific pursuit of the green fireballs in 1949. The effort brought together prominent minds associated with the United States military and scientific programs. Among the key figures were Dr. Lincoln LaPaz of the Institute of Meteoritics at the University of New Mexico, and Dr. William Crozier of the New Mexico School of Mines.
The subject of their research was the persistent sightings of anomalous luminous phenomena—specifically, the "green fireballs"—that were repeatedly observed over New Mexico. The involvement of such specialized personnel indicates that the military treated these incursions as a serious issue requiring rigorous scientific analysis. LaPaz and Crozier collaborated to determine if these fireballs were completely volatilized during flight, leaving behind fine dust that filtered down through the atmosphere.
The Hunt for Physical Evidence: Copper Dust and B-25s
To understand the gravity of the investigations, it is necessary to examine the lengths to which the military was going to capture physical evidence of these objects. The archival file details extensive efforts by scientists like Dr. LaPaz and Dr. Crozier to collect "volatilization products" from the green fireballs. Operating under the assumption that the objects might leave behind a novel type of copper-alloyed dust, researchers developed specialized impactment equipment to capture airborne particles (USAF / AFOSI Project Blue Book files).
The documents reveal that following a fireball sighting over Socorro, New Mexico, scientists coated microscope slides with a "glyceringelatin mixture with an addition of rubeanic acid" to test for copper compounds in the atmosphere. The military even authorized the use of a B-25 bomber from Kirtland Field to fly up to 23,000 feet in an attempt to intercept the trajectory of a fireball and collect atmospheric dust (USAF / AFOSI Project Blue Book files). Despite these exhaustive, highly coordinated efforts, the results were repeatedly deemed negative or inconclusive.
Calculations of Descent: The Search for Materiality
During the investigation, scientists applied fundamental physics to the observational data gathered by military intelligence. Dr. LaPaz noted specific physical characteristics in the data regarding the fireballs' descent. For instance, observations of the endpoints of the fireballs placed the July 24th incident at a height of 10 to 12 miles, and the August 6th incident at 5 to 6 miles.
LaPaz and Crozier analyzed the discrepancy between the computed and observed rates of descent of very fine copper particles. LaPaz suggested that a downward-directed ballistic head wave could easily have carried tiny five-micron particles to within 10,000 feet of the earth at the time of the fall. However, the long-continued appearance of copper particles in the Socorro collections—which grew smaller and smaller in size over a 145-hour period—mirrored the slower rate of descent expected from cosmic dust. Ultimately, the lack of definitive, non-terrestrial copper or ferromagnetic substances left the scientific teams without concrete material proof of the objects' origins (USAF / AFOSI Project Blue Book files).
The FBI's Parallel Record of Flying Discs
The historical footprint of these early UAP investigations is further expanded by the involvement of the Federal Bureau of Investigation. The FBI maintained its own extensive files on the flying disc phenomenon, and their records contain parallel accounts of sightings by credible witnesses.
For example, the FBI files document a September 1947 incident in Portland, Oregon, where Police Chief Leon V. Jenkins and multiple officers observed a high-speed, round, silver object that appeared to change shape as it maneuvered. Similarly, the files detail a July 1947 encounter near Bethel, Alaska, where two experienced commercial pilots flying a DC-3 had to make a forty-five-degree turn to avoid a wing-like object the size of a C-54 aircraft traveling at an estimated 300 miles per hour (FBI file 62-HQ-83894). This highlights the widespread nature of early government UAP investigations, with multiple intelligence apparatuses tracking similar events.
Rewriting the Narrative: Public Rumors and the Red Cross
Beyond the scientific and military data, the FBI documents contain bureaucratic details that highlight the public's reaction to the phenomena. The files explicitly reference the spread of rumors and theories among the civilian population, which the Bureau monitored closely.
In one notable instance from November 1947, a citizen reported that a regional director for the Red Cross had claimed during a dinner speech that the "saucers" were actually from Spain, and that the U.S. government knew this but was keeping it secret (FBI file 62-HQ-83894). The FBI also received letters from citizens speculating that the discs were incendiary devices responsible for forest fires, or that they were connected to underground civilizations. The appearance of these reports in the FBI's internal files demonstrates that the security framework was actively functioning to catalog and assess public anxiety and misinformation.
The Context: Restricted Airspace and National Security
The urgency of these investigations cannot be overstated when viewed in their geographical and historical context. The documents note that sightings of unidentified aerial objects were concentrated heavily over sensitive areas like Albuquerque, Los Alamos, and the White Sands region. This corridor represented the absolute heart of the American nuclear weapons complex, housing the scientists who designed the bombs, the bases that stored them, and the proving grounds where they were tested.
The persistent violation of this highly restricted airspace by objects of unknown origin and capability generated profound attention within the military hierarchy. According to the files, the commanding officers and intelligence divisions responsible for the security of these atomic installations were actively engaged in tracking the sightings. The fear was not necessarily of extraterrestrial visitors, but of a potential foreign technological breakthrough that could bypass American air defenses with impunity.
Why These Details Escaped the Lore
Given the prominence of the scientists involved and the dramatic nature of the sightings, it is notable that some of these specific investigations never became a staple of popular UFO lore. The reason lies in the mechanics of archival routing.
The primary records of the green fireball dust collections were not exclusively filed in the widely circulated Project Blue Book central files, which were later declassified and scoured by civilian researchers. Instead, documents like the Sandia Base library file fell under the purview of the Armed Forces Special Weapons Project (AFSWP). Because they were sequestered within different ecosystems rather than a single public-facing UAP file, the direct involvement of specific researchers and the granular details of the FBI's parallel tracking remained fragmented until these cross-agency files were digitized and correlated.
What the document does not say
To maintain strict archival accuracy, it is vital to outline what these declassified files do not claim:
- The documents do not state that Dr. LaPaz, Dr. Crozier, or the FBI believed the objects were extraterrestrial in origin.
- The files do not provide a definitive identification for the green fireballs or the flying discs, nor do they attribute them to Soviet technology.
- The records do not propose a physical mechanism for how the objects could generate intense light, be tracked visually, or maneuver at such high speeds without leaving a conventional exhaust trail.
- The archive does not indicate that the military successfully recovered any non-terrestrial material from the B-25 flights or the ground-level dust collections.
Read it yourself
Explore the original declassified documents detailing the green fireball investigations and FBI reports:
