Lincoln La Paz Anomalous Luminous Phenomena Seventh Report (May 23, 1950), the Cabell USAF Reporting Directive (Sept 8, 1950), Project Twinkle, and the Datil Stanfield Photograph

Summary

Section 6 of 62-HQ-83894 contains the most substantive scientific document in the entire archive read so far: Dr. Lincoln La Paz’s “Anomalous Luminous Phenomena (Seventh Report)” of May 23, 1950, written from the University of New Mexico Institute of Meteoritics to Lt. Colonel Doyle Rees, 17th District Office of Special Investigations at Kirtland Air Force Base. The Seventh Report extends the six-point Starvation Peak characterization documented in pass 9 (see project-grudge-vital-installations-1948-1949) to eleven specific differences between the Green Fireballs and ordinary meteors, against a corpus of 72 objects classified in the Green Fireball category by May 1950 (~5% of the total unscreened observations La Paz had received).

The report is striking on three counts:

It introduces the concealment-via-meteor-shower hypothesis. La Paz observed that the Green Fireballs cluster in time-windows that overlap known meteor showers (Quadrantid, Perseid, Geminid). His phrase: “This relationship might indicate an attempt to render the green fireballs less conspicuous by causing them to appear only when there is considerable meteoric activity.” The country’s leading meteoriticist, in primary FBI source, asserting deliberate camouflage as a working hypothesis.
It lays out the Soviet-Urals-guided-missile hypothesis with operational specifics. La Paz computed that “missiles moving with velocities of the order of those found for the green fireballs … would travel from the southern Urals to New Mexico in less than 15 minutes,” and observed that the green fireball sighting maximum (~2030 MST) corresponds to ~0700–1300 in the Ural region — the morning window before “cloudiness due to convection or blinding afternoon dust storms can interfere with non-radar tracking, such as has been used by the Optical Trajectory Section at White Sands Proving Ground.”
It quotes La Paz’s own February 20, 1950 letter to Dr. P. H. Wyckoff (Chief, Atmospheric Physics Laboratory, Base Directorate for Geophysical Research) — the letter in which La Paz declined to recommend a fireball project after concluding that the unconventional fireballs were either ordinary meteorites or U.S. guided missiles being tested near sensitive installations, an interpretation he had first proposed at “the first Los Alamos conference on February 17, 1949” in answer to a question raised by Dr. Edward Teller. The most quotable single line in the report: “Even if my interpretation of the unconventional fireballs is the correct one, it is obvious that those in position to confirm it should refuse to do so.”

The report is paired in 62-HQ-83894 Section 6 with three other documents that close several pass-8 and pass-9 open threads:

Maj. Gen. C. P. Cabell’s September 8, 1950 letter to J. Edgar Hoover (Cabell as USAF Director of Intelligence, later Deputy Director CIA), transmitting the AFOIC-CC-1 “Reporting of Information on Unconventional Aircraft” memorandum of the same date — the founding USAF reporting protocol on UAPs to Air Materiel Command MCIS, with the explicit instruction “It is desired that no publicity be given this reporting or analysis activity.” This is the formal directive successor to the March 1949 SAC field-letter named in oak-ridge-gasser-atomic-propulsion-1947-1949 and pass 9.
Lt. Col. Doyle Rees’s May 25, 1950 “Summary of Observations of Aerial Phenomena in the New Mexico Area, December 1948 – May 1950” to Brig. Gen. Joseph F. Carroll, Director of Special Investigations, HQ USAF — the multi-agency cover document that distributes La Paz’s report to FBI El Paso and Albuquerque, AEC Los Alamos, and (originally, before strikethrough) to Joseph Kaplan at the AF Scientific Advisory Board, Wright-Patterson AMC Director of Technical Intelligence, and the Research and Development Board’s Committee on Geophysics and Geography under Dr. H. E. Landsberg.
D. M. Ladd’s October 9, 1950 memo to Director Hoover (FBI serial 162-83894-250) bringing Project Twinkle in Bureau primary source by name. Project Twinkle was the AF observation project at Vaughn, New Mexico set up “for the purpose of obtaining data regarding these unusual aerial phenomena which had been seen in the vicinity of sensitive installations in New Mexico.” Project Engineer: Dr. Anthony O. Mirarchi. Land-Air, Inc. was the contractor. The Bureau routinely received approximately 3–4 complaints per month June–September 1950 and noted no observable increase during or as a result of the Korean War.
The Datil NM photograph by Cpl Lertis E. Stanfield (Holloman AFB), February 24–25, 1950, with La Paz’s published verdict — not the moon, not Venus, not a planet, not a fixed star out of focus — and an excerpt of the OSI cumulative sighting log including a January 1948 USSR sighting on a line between Brest and Kiev.

What the Section 6 Documents Document

La Paz Seventh Report — eleven differences from ordinary meteors (Section 6 pages 27–28)

“(1) The horizontal nature of the paths of most of the December fireballs is most unusual. Genuine meteors are rarely observed to move in horizontal paths.

(2) Again the very low height of the December fireball discussed in section 2 above sets it off in sharp contrast from the genuine meteors for which heights of the order of 40 or more miles are normally observed.

(3) The velocity determined for the fireball of December 12 is much less than the velocities determined from typical meteors (and yet is considerably greater than the speeds of the V-2 Rockets or jet planes or of conventional flares).

(4) In the case of meteorites that penetrate to as low levels as that determined for the fireball of December 12, the observed luminous phenomena are always accompanied by very violent noises. No noises whatever have been observed in connection with the various December fireballs so far investigated. (Note added on 1950, May 23: Possible exceptions to the noiselessness of green fireballs are the incidents of 1949, January 30, and 1949, December 4.)

(5) Genuine meteors normally show remarkable variations in brightness, beginning as fine thin hair lines, which are scarcely visible to the observer, and then brightening up to flash out near the end of their paths. In the case of the December fireballs most of the observers have reported that the green balls appeared almost instantly at their full brightness.

(6) In the case of genuine meteors the paths are directed toward all points of the compass with equal frequency. On the contrary in the case of the green fireballs, plots of admissible approach sectors show that there is a very pronounced tendency for the paths to come in from the north half of the sky.

(7) The three groups of anomalous greenish luminous phenomena show a curious association with well known meteor showers, although none of these meteor showers normally produce extremely bright green fireballs, such as those recently observed… This relationship might indicate an attempt to render the green fireballs less conspicuous by causing them to appear only when there is considerable meteoric activity.

(8) As noted in an earlier communication, the remarkably vivid green color reported for most of the December fireballs is rarely observed in the case of genuine meteors. By laboratory test this peculiar color seems to be identical with that given off by copper salts in the blowpipe flame. If this identification is correct, the wave length of the radiation from the green fireballs is near λ = 5218Å.

(9) The duration estimates of between 2 and 3 seconds reported for the green fireballs are considerably longer than those (0.4 - 0.5 seconds) for the ordinary visual meteors, but shorter than the duration estimates invariably reported in the case of a genuine meteorite fall (5 to 30 seconds or even longer).

(10) For none of the green fireballs has a train of sparks or a dust cloud been reported. This contrasts sharply with the behavior noted in case of meteoric fireballs—particularly those that penetrate to the very low levels where the green fireball of December 12 was observed.” — La Paz to Lt. Col. Doyle Rees, “Anomalous Luminous Phenomena (Seventh Report),” May 23, 1950 (Section 6 pages 27–28)

The Seventh Report adds the eleventh:

“An analysis just completed of the time distribution of the green fireballs so far observed permits us to add an 11th item to the list of differences given in paragraph 1 above. The graph of frequency versus local time which accompanies the present report shows that the maximum frequency of sighting of green fireballs (occurring at approximately 2030) coincides in time with neither the frequency maximum for ordinary meteors (occurring at approximately 0300) nor the frequency maximum for meteorite falls (occurring at approximately 1600).” — Section 6 page 29

The Soviet-Urals hypothesis (Section 6 page 29)

“Some significance may attach to the fact that the time interval alluded to in paragraph 4 extends from about 7 a.m. to 1 p.m. in the Ural region of the USSR. Since missiles moving with velocities of the order of those found for the green fireballs for which real path determinations have been possible would travel from the southern Urals to New Mexico in less than 15 minutes, a possible interpretation of the concentration of sightings referred to in paragraph 4 is that the green fireballs result from guided missiles launched from bases in the Urals in the morning hours before cloudiness due to convection or blinding afternoon dust storms can interfere with non-radar tracking, such as has been used by the Optical Trajectory Section at White Sands Proving Ground.” — Section 6 page 29

This is La Paz the meteoriticist computing transit times from a Soviet-launch site to New Mexico and aligning the diurnal-frequency distribution with a Ural-morning launch window, in primary FBI source. The methodological caveat — Optical Trajectory Section at White Sands tracks via non-radar — is a working professional’s account of why Russian operators would prefer cloudless morning launches.

The Kaplan / Von Karman dismissal (Section 6 page 29)

“Although I have recently received from Dr. Joseph Kaplan of the Scientific Advisory Board a letter containing the statement ‘Frankly, I don’t know of any U. S. experiments that would result in the appearance of these unconventional objects, and neither does Von Karman’.” — Section 6 page 29

Joseph Kaplan was Chairman of the AF Scientific Advisory Board. Theodore von Kármán was the most influential aerospace theorist of the era — the founding director of NACA’s Institute of Aeronautical Sciences, the Caltech aerodynamicist who shaped the U.S. supersonic-flight program. La Paz, in primary FBI source, in 1950, in writing, telling Doyle Rees that Kaplan and von Kármán did not know of any U.S. experiments that could account for the Green Fireballs. This is a load-bearing scientific-establishment denial of secret-US-test attribution, paired with La Paz’s earlier-letter assertion that the U.S.-test interpretation was nonetheless the correct one.

The Wyckoff letter — “those in position to confirm it should refuse to do so” (Section 6 page 30)

La Paz’s quoted February 20, 1950 letter to Dr. P. H. Wyckoff, Chief Atmospheric Physics Laboratory, Base Directorate for Geophysical Research, embedded in the May 23 report:

“I have come to the conclusion that, on the basis of the evidence now available to me, I would not be justified in recommending a fireball project. In my opinion, this evidence proves conclusively that the fireballs reported on fall into one of two categories: Those of the first category (the majority) are meteorite falls of unusual, but certainly not of impossible, magnitude, frequency and other characteristics; those of the second category (the minority) are U. S. guided missiles undergoing tests in the neighborhoods of the sensitive installations they are designed to defend. This interpretation of the latter category is the one that I proposed in answer to a question raised by Dr. Teller at the first Los Alamos conference on February 17, 1949. It was not taken seriously then and I doubt that it will be taken seriously at the present time. However, even if my interpretation of the unconventional fireballs is the correct one, it is obvious that those in position to confirm it should refuse to do so.” — La Paz to Wyckoff, February 20, 1950, quoted in La Paz Seventh Report (Section 6 page 30)

The “first Los Alamos conference on February 17, 1949” is the formal scientific conference referenced in project-grudge-vital-installations-1948-1949 (where SAC San Antonio’s March 22, 1949 letter dated the AMC T-2 transition meeting to February 16, 1949 — these are the same meeting, possibly with different recorded dates due to multi-day session). Edward Teller was present. La Paz proposed the U.S.-tests-near-sensitive-installations hypothesis at that conference and saw it dismissed.

The closing line — “those in position to confirm it should refuse to do so” — is one of the most quotable single sentences in the entire 62-HQ-83894 archive. It is La Paz’s own articulation of the operational secrecy logic: even a correct U.S.-tests interpretation, if confirmed, would compromise the secret-tests it was confirming. The honest analyst’s recommendation in that scenario is to refuse to confirm.

The recommended named project team (Section 6 pages 30–31)

If the U.S.-tests interpretation were wrong — if the green fireballs were not U.S. missiles — La Paz recommended an immediate project under the following named leads:

Dr. Fred L. Whipple, Harvard College Observatory — photographic phase. Whipple would later become director of the Smithsonian Astrophysical Observatory and the originator of the “dirty snowball” comet model.
Dr. Peter M. Millman, Dominion Observatory (Canada) — spectrographic phase. Millman was the leading Canadian meteor spectroscopist of the era.
Dr. L. A. Manning, Stanford + Millman — radar investigation.
Dr. William Crozier, New Mexico School of Mines — dust collection and identification.

La Paz also formally offered to serve as consultant on the project on a voluntary basis rather than the $40/day contract specified by Major Oder’s November 29, 1949 letter. The willingness to decline payment is a rare datum in a Bureau file — most consultants in this era took the contract.

The Datil Stanfield photograph and La Paz’s analysis (Section 6 page 33)

The May 25, 1950 OSI summary cover document includes (as one of “Sighting No. 175” in the cumulative log) a photograph of an unknown aerial phenomenon taken at Datil, New Mexico, by Cpl Lertis E. Stanfield (Holloman Air Force Base, NM) on February 24 and 25, 1950. La Paz’s analytical conclusions, transcribed in the OSI cover memo:

“a. The angular diameter of the perfectly round luminous object Stanfield observed was approximately 1/4 of a degree.

b. The angular velocity of the object in the sky was greater than half a degree per minute.

Dr. LaPaz stated that on the basis of the results (a) and (b) above, the object seen by Stanfield was not the moon (for the angular diameter is too small), it was not Venus or any other planet (for the angular diameter is too large), and it was not a bright fixed star slightly out of focus (for the observed rate of motion is double that due to the diurnal rotation of the earth).” — Section 6 page 33

A four-condition deflationary check (moon / planet / bright fixed star / instrumental focus) by the country’s leading meteoriticist, all four ruled out, transcribed into a USAF OSI cover memorandum and forwarded to FBI El Paso and Albuquerque. The fact that the angular velocity was approximately twice the apparent diurnal rotation rate is the methodological hinge — if it had matched, the object would have been a fixed star out of focus.

The Cabell→Hoover letter and AFOIC-CC-1 directive (Section 6 pages 10–12)

The cover letter, in full:

“The inclosed letter, subject: ‘Reporting of Information on Unconventional Aircraft,’ is forwarded for your information and any cooperation you may be able to extend.

As indicated in the letter it is desired to place this subject in its proper perspective as part of the normal USAF requirement for information of air technical intelligence interest.

Respectfully yours,

C. P. CABELL Major General, USAF Director of Intelligence” — Cabell to Hoover, September 8, 1950 (Section 6 page 10, FBI serial 62-83894-249)

The enclosure, AFOIC-CC-1, defines the working term:

“An unconventional aircraft, within the meaning of this directive, is defined as any aircraft or airborne object which by performance, aerodynamic characteristics, or unusual features, does not conform to any presently known aircraft type.” — Section 6 page 11

It establishes the reporting structure (electrical reports to AMC MCIS with nine specific data elements; AF Form 112 written follow-up within 10 days; physical-evidence transport to Wright-Patterson AMC Attn: MCIS), and closes with:

“It is desired that no publicity be given this reporting or analysis activity.” — Section 6 page 12

The info-copies distribution — Director of Intelligence G-2 Army, Director of Naval Intelligence, Coast Guard INT, Special Assistant for Research & Intelligence at State, Director FBI, Director of CIA — establishes the document as the founding multi-agency UAP-reporting channel. C. P. Cabell signed it as USAF Director of Intelligence; he became Deputy Director of CIA on April 23, 1953, less than three years after issuing this directive. The directive he signed at USAF was the bridge to the ATIC (Air Technical Intelligence Center) reporting infrastructure that processed UAP cases through Project Blue Book and beyond.

The handwritten Bureau marginalia on the cover sheet reads “See SAC letter #38 / Sever 1949 / dated 3/25/49 Ehw” — explicitly cross-referencing this directive to the March 25, 1949 FBI SAC field-letter documented in pass 9, confirming that the September 1950 directive is the formal successor to the same reporting line.

The Doyle Rees / Carroll cover document and the multi-agency distribution (Section 6 pages 24–26)

Lt. Col. Doyle Rees, 17th District OSI at Kirtland AFB, NM, May 25, 1950, “Summary of Observations of Aerial Phenomena in the New Mexico Area, December 1948 – May 1950,” to Brig. Gen. Joseph F. Carroll, Director of Special Investigations, HQ USAF. Carroll later became the founding director of the Defense Intelligence Agency.

Distribution list (Section 6 page 26):

6 cys, Director of Special Investigations, HQ USAF
~~1 cy, CG, Air Materiel Command, Wright-Patterson AFB, Ohio, ATTN: Director of Technical Intelligence~~ (struck through)
1 cy, CG, Special Weapons Command, Kirtland AFB, NM
1 cy, CG, Armed Services Special Weapons Project, Sandia Base, NM, ATTN: J-2
~~1 cy, CG, Headquarters, Fourth Army, Ft. Sam Houston, Texas, ATTN: AC of S, G-2~~ (struck through)
1 cy, CO, Holloman AFB, NM
~~1 cy, CO, Air Force Cambridge Research Laboratories, Cambridge, Mass.~~ (struck through)
1 cy, Director, Security Division, U.S. Atomic Energy Commission, Los Alamos, NM, ATTN: Mr. B. O. Wells
1 cy, Federal Bureau of Investigation, El Paso, Texas
1 cy, Federal Bureau of Investigation, Albuquerque, NM
~~1 cy, Air Force Scientific Advisory Board, Pentagon Building, ATTN: Dr. Joseph Kaplan~~ (struck through)
~~1 cy, Research and Development Board, Pentagon Building, ATTN: Dr. H. E. Landsberg, Executive Director, Committee on Geophysics and Geography~~ (struck through)
1 cy, File

The strikethrough on Wright-Patterson AMC, on Fourth Army G-2, on AF Cambridge Research Laboratories, on Joseph Kaplan, and on H. E. Landsberg’s R&D Board committee is itself a documentary finding — by May 1950 the OSI was deliberately narrowing the multi-agency distribution from its original list to a tighter set focused on Special Weapons Command, Sandia, Holloman, AEC Los Alamos (B. O. Wells), and the two FBI offices closest to the New Mexico nuclear-weapons complex. The original distribution list shows that AMC Director of Technical Intelligence, AF Scientific Advisory Board, and the R&D Board’s Geophysics committee were originally in scope; the post-strikethrough list shows the case being scoped down to operational nuclear-installation defense and Bureau internal-security partners.

Project Twinkle in Bureau primary source (Section 6 page 13)

D. M. Ladd’s memo to Director, October 9, 1950 (FBI serial 162-83894-250):

“You will recall that on August 23, 1950, I furnished to you a memorandum regarding Project Twinkle set up by the Department of the Air Force, with the assistance of Land-Air, Inc., at Vaughn, New Mexico, for the purpose of obtaining data regarding these unusual aerial phenomena which had been seen in the vicinity of sensitive installations in New Mexico. To date the Air Force has not advised us of any new developments in connection with this project.

Dr. Anthony O. Mirarchi, Project Engineer of Project Twinkle, has been contacted by the Albuquerque Office and arrangements have been made in order that the Bureau will be advised in the event any information relative to these phenomena indicates any jurisdiction on the part of the Bureau.

According to Bureau files, an average of approximately three or four complaints have been received per month from June through September. These complaints were brought to the attention of OSI. A review of Bureau files does not indicate that there has been any increase in the sightings of these phenomena during or as a result of the war in Korea.” — D. M. Ladd to Director, October 9, 1950 (Section 6 page 13, FBI serial 162-83894-250)

Project Twinkle was the AF observational/photographic effort at Vaughn, New Mexico, contracted through Land-Air, Inc., set up specifically for “data regarding these unusual aerial phenomena which had been seen in the vicinity of sensitive installations in New Mexico.” This is the direct operational descendant of La Paz’s recommendation in the Wyckoff letter — instrumented multi-station observation of the green fireball and related phenomena. Dr. Anthony O. Mirarchi is named as Project Engineer in primary FBI source.

The Bureau’s own complaint-rate baseline — 3–4 per month June through September 1950 — is a data point on civilian-witness traffic flow during the early Korean War period. Korea did not move the needle.

The OSI Summary Sighting Table excerpt with Brest-Kiev USSR sighting (Section 6 page 34)

The four-row excerpt from the OSI cumulative sighting log includes a January 18, 1948 entry: “Point of impact on line between Brest and Kiev.” Reliability “R” (Reliable). Color “Brilliant white.” Duration 2–3 seconds. No sound. “Compare w/planet Venus on unusually clear night.” Path: “Almost vertical descent followed by ‘bouncing’ N to S.” Apparent altitude: “35° above Horizon Descending.”

The presence of a Soviet-territory UAP sighting in the OSI cumulative log is direct primary-source evidence that Air Force / OSI intelligence was tracking observations from inside the Soviet Union as part of the same case-file series in 1948–1950. How the report reached the 17th District OSI from a Brest-Kiev observer is not stated; the format suggests it came through standard intelligence channels. A reliability rating of “R” against an unnamed observer in 1948 USSR is itself a methodological flag — OSI graded the source.

Why This Matters

La Paz’s eleven-point characterization is the most rigorous mid-century scientific deflation-rejection of UAP phenomena in primary FBI source. Eleven specific differences from ordinary meteors, against a 72-object catalog, with a published-scientist signature. Anyone making a serious historical case about whether the Green Fireballs were natural or artificial has to reckon with this document.
The concealment-via-meteor-shower hypothesis is now in primary FBI source. Not as speculation on UFO message boards, but as a working hypothesis from the country’s leading meteoriticist, advanced in writing to a USAF OSI commanding officer in 1950: “This relationship might indicate an attempt to render the green fireballs less conspicuous by causing them to appear only when there is considerable meteoric activity.”
The Soviet-Urals-launch hypothesis with operational specifics is now in primary FBI source. La Paz computed transit times (southern Urals → NM in <15 minutes) and aligned the diurnal-frequency distribution with a Ural-morning launch window. This is named-source-attributed, technically-detailed Soviet-attribution analysis in the FBI internal record.
The “those in position to confirm it should refuse to do so” line. Operational-secrecy logic in primary form. La Paz arguing that even a correct U.S.-tests interpretation, once confirmed, would compromise the underlying program. One of the most quotable single sentences in the entire archive.
Edward Teller, Joseph Kaplan, Theodore von Kármán, and Fred Whipple are all named in primary FBI source on the Green Fireball question. Teller as the “first Los Alamos conference” interlocutor (February 17, 1949); Kaplan as Scientific Advisory Board Chairman who wrote “I don’t know of any U. S. experiments that would result in the appearance of these unconventional objects, and neither does Von Karman”; Whipple as La Paz’s recommended photographic-phase project lead. The names anchor the document chain to the actual senior US scientific establishment of the era.
The Cabell USAF Reporting Directive (AFOIC-CC-1, September 8, 1950) is the founding multi-agency UAP reporting channel in primary form. Closes pass 8/9 open thread. Cabell signed as USAF Director of Intelligence; he became Deputy Director of CIA in 1953. This is the directive that established the AMC MCIS pipeline that became ATIC and ran the Project Blue Book era.
Project Twinkle is in Bureau primary source by name with Project Engineer Dr. Anthony O. Mirarchi and contractor Land-Air, Inc., located at Vaughn, NM. Closes another pass-9 open thread.
The OSI distribution-list strikethroughs show by-1950 narrowing of the multi-agency UAP-data scope from broad (AF Scientific Advisory Board, R&D Board Geophysics committee, Wright-Patterson AMC, Fourth Army G-2) to operational nuclear-installation focus (Special Weapons Command, Sandia, Holloman, AEC Los Alamos, FBI El Paso/Albuquerque). The pattern of who was cut from distribution is itself a finding.
The Datil Stanfield February 1950 photograph is one of the few in-archive primary-source UAP photographs surviving with a published-scientist-signed analytical verdict. La Paz’s four-condition deflationary check (moon/planet/star/focus) with all four ruled out is a citable methodological precedent.
A Soviet-territory UAP sighting in the OSI cumulative log (Brest-Kiev, January 18, 1948, Reliable rated). Direct primary-source evidence of US intelligence tracking inside-USSR observations as part of the same case file.

Connections

PURSUE full inventory
PURSUE master report (master synthesis)
project-grudge-vital-installations-1948-1949 — pass 9 source page; this report extends the six-point Starvation Peak summary to eleven points and adds the Wyckoff letter / Teller-Los Alamos thread
oak-ridge-gasser-atomic-propulsion-1947-1949 — pass 8 source page; the Cabell directive is the formal successor to the SAC field-letter documented there
rhodes-phoenix-photographs-1947
maury-island-1947
muroc-1947-cic-affidavits
1947-california-montana-cic
davidson-brown-crash-mission-report
philadelphia-1950-soap-suds-disc
UAP disclosure (concept)

Open Questions

La Paz’s First through Sixth reports in the same series. The Seventh Report explicitly references the Second Report (“dated 1948, December 20”) which contained the original ten-point characterization. The First, Third, Fourth, Fifth, and Sixth reports presumably exist in the AMC T-2 / Wright-Patterson archive and may be in unread portions of Section 6.
The accompanying frequency-vs-local-time graph referenced in paragraph 3 of the Seventh Report. Mentioned but not visible in the OCR’d page. Likely a separate inclosure that may or may not be in the PURSUE release.
Project Twinkle output data. The FBI noted in October 1950 that “the Air Force has not advised us of any new developments in connection with this project.” Project Twinkle’s actual photographic and instrumented results — which were later declassified and known to be largely null — would be at AMC T-2 / Wright-Patterson archives.
Dr. Anthony O. Mirarchi’s later writings. He went on to publicly assert (1951–1953) that the Green Fireballs were of extraterrestrial origin. The trajectory from “Project Engineer in 1950” to “ET-attribution proponent in 1951+” is outside this archive but documented in mid-century UFO history.
The first Los Alamos conference (February 17, 1949) full attendee list and notes. Edward Teller’s question to La Paz that prompted the U.S.-tests-near-sensitive-installations hypothesis. The conference notes presumably exist at LANL or in AMC T-2 records; not in this PURSUE release.
The B. O. Wells AEC Los Alamos copy of the May 1950 OSI summary. Wells was the AEC Security Division’s named recipient. Whether AEC’s own analytical response survives is outside this archive.
Dr. Fred L. Whipple’s response to the proposed photographic-phase lead role. La Paz recommended him in May 1950; whether Whipple ever took on the role formally is outside this archive.
The full text of the Joseph Kaplan letter to La Paz containing the Von Kármán denial. Quoted but not reproduced in the OCR’d portions read.
The Brest-Kiev January 1948 USSR sighting source. Reliability “R” but observer name and channel of report not in the table excerpt. Whether the full OSI cumulative sighting log contains the channel data is a Section 6 follow-up read question.

Quotes Worth Keeping

“This relationship might indicate an attempt to render the green fireballs less conspicuous by causing them to appear only when there is considerable meteoric activity.” — Lincoln La Paz, “Anomalous Luminous Phenomena (Seventh Report),” May 23, 1950 (Section 6 page 28). The country’s leading meteoriticist, in primary FBI source, advancing concealment-via-meteor-shower as a working hypothesis on the Green Fireball phenomena.

“Frankly, I don’t know of any U. S. experiments that would result in the appearance of these unconventional objects, and neither does Von Karman.” — Dr. Joseph Kaplan, AF Scientific Advisory Board, to La Paz, quoted in La Paz Seventh Report (Section 6 page 29). The Chairman of the AF Scientific Advisory Board and the most influential aerospace theorist of the era both stating they did not know of any U.S. experiments that could account for the Green Fireballs.

“Even if my interpretation of the unconventional fireballs is the correct one, it is obvious that those in position to confirm it should refuse to do so.” — La Paz to Wyckoff, February 20, 1950, quoted in La Paz Seventh Report (Section 6 page 30). The operational-secrecy-logic line — possibly the most quotable single sentence in the entire 62-HQ-83894 archive.

“This interpretation of the latter category is the one that I proposed in answer to a question raised by Dr. Teller at the first Los Alamos conference on February 17, 1949. It was not taken seriously then and I doubt that it will be taken seriously at the present time.” — La Paz to Wyckoff, February 20, 1950, quoted in La Paz Seventh Report (Section 6 page 30). Edward Teller in primary FBI source as the “first Los Alamos conference” interlocutor on the Green Fireball question.

“An unconventional aircraft, within the meaning of this directive, is defined as any aircraft or airborne object which by performance, aerodynamic characteristics, or unusual features, does not conform to any presently known aircraft type.” — AFOIC-CC-1, “Reporting of Information on Unconventional Aircraft,” September 8, 1950 (Section 6 page 11). The founding USAF working definition of an “unconventional aircraft” for technical-intelligence reporting purposes, signed by Maj. Gen. C. P. Cabell as Director of Intelligence.

“It is desired that no publicity be given this reporting or analysis activity.” — AFOIC-CC-1 closing instruction, September 8, 1950 (Section 6 page 12). The publicity-suppression direction in primary form.

“Project Twinkle set up by the Department of the Air Force, with the assistance of Land-Air, Inc., at Vaughn, New Mexico, for the purpose of obtaining data regarding these unusual aerial phenomena which had been seen in the vicinity of sensitive installations in New Mexico… Dr. Anthony O. Mirarchi, Project Engineer of Project Twinkle…” — D. M. Ladd to Director, October 9, 1950 (Section 6 page 13, FBI serial 162-83894-250). Project Twinkle and its named Project Engineer in primary FBI source.

“Dr. LaPaz stated that on the basis of the results (a) and (b) above, the object seen by Stanfield was not the moon (for the angular diameter is too small), it was not Venus or any other planet (for the angular diameter is too large), and it was not a bright fixed star slightly out of focus (for the observed rate of motion is double that due to the diurnal rotation of the earth).” — OSI 17th District summary cover, May 25, 1950 (Section 6 page 33). La Paz’s four-condition deflationary check on a USAF airman’s photograph, all four ruled out, transcribed into a primary FBI-distributed OSI cover memorandum.