The James Tuck Correspondence: A Los Alamos Physicist, the 1948-1951 Green Lights, and the Condon Report

Source file: DOE-UAP-D002_JamesTuck_Correspondence.pdf Originating agency: Department of Energy / Los Alamos National Laboratory Date range: November 1970 – late 1970s (sightings recalled: 1948-1951) Page count: 4 (all read) PURSUE Release: 2

Summary

This document is a four-page bundle of correspondence associated with James L. Tuck (1910-1980), the British-American physicist who worked at Los Alamos on the Manhattan Project — notably on the explosive lenses for implosion — and who later pioneered controlled-fusion research with the "Perhapsatron." Tuck was also widely known for his serious scientific interest in ball lightning. The pages comprise: a 1970 handwritten letter recalling green-light sightings over Los Alamos in 1948-1951; a December 1970 typed letter from Tuck to the U.S. Army Engineering School requesting the technical "recipe" for simulated atomic-bomb demonstrations in order to study the "large atmospheric vortices" referenced in the Condon Report; and a later typed note enclosing UFO literature on ball lightning and propulsion. Together they document how a senior nuclear physicist treated anomalous aerial phenomena as a legitimate object of inquiry, tying the Los Alamos "green fireball" era to mainstream scientific channels.

Research Article

James L. Tuck and why this matters

James Tuck was not a fringe figure. A protégé of Mark Oliphant, he came to Los Alamos during the war and contributed to the implosion design at the heart of the first plutonium weapon. After the war he became a leader of early American fusion research and a fixture of the Los Alamos scientific community. He was also one of the few establishment physicists who took ball lightning seriously as a physical phenomenon. Correspondence on UFO-related "green lights" and "atmospheric vortices" passing through Tuck's office therefore carries unusual weight: it shows the topic being handled inside one of the world's premier weapons laboratories by a scientist of standing, not dismissed out of hand.

The 1970 handwritten recollection (pages 1-2)

The first two pages are a handwritten letter dated November 23, 1970, addressed "Dear Mr. Tuck." The writer apologizes that he cannot fill out attached forms because the exact times and dates escape him, but offers a substantive recollection. During the years 1948 through 1951, he writes, several sightings of green lights were made at Los Alamos. These usually occurred during the early part of the night — "nine to eleven" — and were usually in the Jemez Mountains. He recalls "several instances of green lights weaving in and out of mountain peaks," and stresses that "this was all reported to the Protective Force Headquarters and should be a matter of record on their logs."

He adds a distinct daylight event: "one instance of five objects flying over Los Alamos in the afternoon," flying "from southeast to northwest" and appearing "to be flying in formation." A named member of the Protective Force (redacted under (b)(6)) was, he says, one of the five or six people who sighted these objects, and he suggests another Protective Force contact who might be checked. Any Protective Force members who were on "the Hill" — the longstanding nickname for Los Alamos — during the early 1950s should recall the reported sightings. He closes by noting that if the pro-force logs from that period can be accessed, the times and dates of the green-light sightings could be recovered, and signs off, "Good Luck."

This recollection is historically significant because 1948-1951 is precisely the period of the famous "green fireball" sightings over New Mexico, which prompted official concern at Los Alamos, Sandia, and Kirtland, the convening of the 1949 Los Alamos conference attended by astronomer Lincoln LaPaz, and ultimately Project Twinkle. The letter is a first-hand witness recollection feeding into that history, and it specifically points investigators toward the contemporaneous Protective Force security logs as a documentary record.

Tuck's 1970 letter on atmospheric vortices (page 3)

The third page is a typed letter dated December 16, 1970, from Tuck (signed "James L. Tuck," with the typist's mark "JLT:gaa") to a correspondent at the U.S. Army Engineering School, Fort Belvoir, Virginia, addressed to the Department of Mechanical and Technical Equipment. Following up a phone conversation, Tuck writes: "I would like to have the recipe that was used for the simulated atomic bomb demonstrations. We are interested in the large atmospheric vortices which are produced as reported in the book 'Scientific Study of Unidentified Flying Objects' by Dr. Edward U. Condon."

This is a remarkable sentence. Tuck is explicitly citing the Condon Report — the University of Colorado study commissioned by the Air Force and published in 1968, the document widely credited with providing the rationale for closing Project Blue Book — and pursuing a specific physical mechanism (large atmospheric vortices produced by simulated nuclear-blast demonstrations) as a possible explanatory avenue. It situates Tuck's interest not in the speculative but in the experimental: he wanted the actual procedure used to generate such vortices so the physics could be examined.

The ball-lightning note (page 4)

The fourth page is a typed note dated "November 28" (no year on the page; the enclosed reference is dated 1976), addressed "Dear Jim." The writer states: "Mindful of your interesting report on ball lightning, I am enclosing comments on same by a UFO believer, James M. McCampbell, in his UFOLOGY, 1976," available at the Mesa Library. He continues that McCampbell's chapter "FLIGHT AND PROPULSION strengthens my conviction that Einstein, while seemingly straying from the main current of physical research in his later years, was on scent like a bloodhound when he persisted in trying to lock in on a unified field theory."

This page confirms Tuck's standing report on ball lightning and shows colleagues forwarding him UFO literature, connecting his work to popular UFO writing of the period and to grand physics speculation about unified field theory and propulsion.

Significance

The correspondence is not a sighting report in the conventional sense; its value is documentary and historical. It establishes a credible chain linking the 1948-1951 Los Alamos green-light/green-fireball episodes to named security records (the Protective Force logs), and it shows a Manhattan Project physicist engaging the subject through the Condon Report and through the physics of atmospheric vortices and ball lightning. For an archive tracing official and institutional handling of UAP, this is a high-value primary source: the phenomena are being taken seriously, by a serious scientist, inside the nuclear weapons complex.

Key People

Locations

Incidents

Notable Quotes

"...during the years 1948 through 1951, several sightings of green lights were made at Los Alamos. These usually occurred during the early part of the night, nine to eleven, and were usually in the Jemez Mountains." — page 1 (handwritten)

"I can recall several instances of green lights weaving in and out of mountain peaks. This was all reported to the Protective Force Headquarters and should be a matter of record on their logs." — pages 1-2 (handwritten)

"I also recall one instance of five objects flying over Los Alamos in the afternoon. They were flying from southeast to northwest and appeared to be flying in formation." — page 2 (handwritten)

"I would like to have the recipe that was used for the simulated atomic bomb demonstrations. We are interested in the large atmospheric vortices which are produced as reported in the book 'Scientific Study of Unidentified Flying Objects' by Dr. Edward U. Condon." — page 3, James L. Tuck, December 16, 1970

"Mindful of your interesting report on ball lightning, I am enclosing comments on same by a UFO believer, James M. McCampbell, in his UFOLOGY, 1976... His chapter FLIGHT AND PROPULSION strengthens my conviction that Einstein... was on scent like a bloodhound when he persisted in trying to lock in on a unified field theory." — page 4