NASA-UAP-D018, Gemini 4 Experiment Debriefing, 1967
Gemini IV was the second crewed mission of the Gemini series. Astronauts James McDivitt and Edward White successfully completed the four-day flight between June 3 and June 7, 1965. The mission included the first American spacewalk. This collection of documents contains a transcription of the astronauts recounting their observations of bright particles outside the spacecraft, dated circa June 25, 1967, on pages 78-81, and page 101.
The summary above is sourced from the released file metadata as published to war.gov. The analysis sections below are original to this tracker.
Text of the document
Machine-extracted from the PDF war.gov published (its text layer or OCR), so expect errors, especially in names, numbers and handwriting; the PDF is the authoritative copy. Lines that did not extract as readable text are left out. Showing about 999 words from pages 1, 2, 3, 4, 5 of 224.
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NATIONAL AERONAUTICS AND SPACE ADMINISTRATlo-1 ROUTING SLIP MAIL CODE NAME Call Me Investigate and Advise Note and R_e_hl_rn___ _ Per Teleph one Conversation Circulate and De s I roy NASA FORM 26 APR 69 PREVIOUS EDITIONS MAY BE USED
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Mission Operation Report From M/Associate Administrator for Manned Space Flight Subject: Gemini Flight Number Four (GT-4) Additional Flight Activities Subsequent to the preparation of the GT-4 Mission Operation Report several new procedures and items of equipment have progressed to a stage of flight readiness. Consequently, three significant additional flight activities are now possible and have been included in the mission. These activities are: extra vehicular activities (EVA); extra vehicular propulsion; and demonstration of rendezvous with the booster second stage. Additional details of these flight plan activities are provided in the attached supplement to the basic MOR No. 913-65-04 FOR INTERNAL USE ONLY
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ADDITIONAL GT-4 FLIGHT PLAN ACTIVITIES Three additional special engineering and operational objectives are now planned for the first four orbits of the GT-4 Mission: 1. Demonstration of extravehicular activities (EVA) using a 25 foot umbilical. Potential future application includes crew transfer, in flight repair, and inspection of orbiting objects. 2. Demonstration of extravehicular maneuvering using a simple, one man propulsion unit. This device could be used with or without a spacecraft tether on future missions. 3. Demonstration of rendezvous with the booster second stage. This activity wilI provide valuable early information and maneuvering procedures necessary to rendezvous with a target vehicle. Flashing lights identical to those designed for the Gemini/Agena Vehicle have been instaI led on the booster second stage for th is test. The Flight Plan sequence involves post-launch separation from the launch vehicle, then maneuvering to stop the spacecraft separation velocity. The first two orbits wilI be flown with the spacecraft at distances less than one quarter of a mile from the launch vehicle. Nighttime separation will be sufficient to prevent the flashing lights from disturbing the pilot's visual dark adaptation. The first orbit will be occupied with operational checks of the spacecraft guidance, maneuvering, and environmental control systems. The pilots will utilize the second orbit to prepare for the extravehicular activity. This procedure involves unstowing and assembling a 25-foot umbilical, the emergency oxygen pack, a maneuvering unit, and the cameras. Over Hawaii, at daybreak, near the end of the second orbit, the cabin will be depressurized and Jim McDivitt will maneuver to within close proximity of the booster. At this point, the right hatch will be opened and Ed White will climb out and hold on the right forward portion of the spacecraft unti I McDivitt gives him a release command. Upon command, White wi II push off slowly and reorient himself with the hand-held maneuvering unit to face the booster. A 35-mm still camera (Zeiss-Contarex) mounted on the maneuvering unit will be used to photo graph the booster and spacecraft with various earth/sky backgrounds. After testing his ability to maneuver in a zero gravity environment, White will maneuver back toward the spacecraft and ingress. The total time separated from the spacecraft will be approximately 10 minutes. He will be inside with the cabin repressurized by the time the spacecraft posses over Ascension Island on the start of the third orbit. Shortly ofter passing Ascension, McDivitt wil I maneuver ahead of the booster with 5 feet per second separation velocity. Because this maneuver places the spacecraft in a higher altitude and longer period orbit than the booster, it will rise above and fall behind the booster. One orbit later, the spacecraft
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will trail 16 miles behind the booster. At this point, a spacecraft retardation maneuver of 13 feet per second will initiate the visual rendezvous sequence. The spacecraft will approach the booster from behind and below. Because of unknown variation in the atmospheric density and drag of the slowly tumbling booster, the exact approach trajectory cannot be predicted. The flight crew will measure elevation angles of the booster and wil I initiate rendezvous maneuvers when the booster is approximately 45 degrees elevation angle above the spacecraft. By observing the movement of the booster with respect to the star background and with respect to the spacecraft inertial platform display, the crew can determine the proper lateral maneuver to null the lateral component of velocity thereby resulting in a spacecraft velocity vector which is directly toward the booster. After removing the lateral velocity difference, the pilot will apply a series of breaking maneuvers with the forward firing thrusters to reduce the closing velocity. The flight crew will measure with onboard instruments the total maneuvering velocity required for the rendezvous procedure. The spacecraft should be back in close proximity of the launch vehicle over the Northeast coast of South America at the beginning of the fifth orbit. After the rendezvous operation is complete, the spacecraft will again separate from the booster - this time using a maneuver which will place the Gemini spacecraft on an orbit with a predicted lifetime of four days. The EVA suit is the new G4C suit which replaces the G3C suit used so successfully by the GT-3 flight crew. The G4C suit has the following new a. Helmet - incorporation of triple lens shield (visors) for visual, thermal, impact, and micrometeorite protection. 1. Change to Nomex (HT-1) 11 Linknet11 in restraint layer for increased structure I strength. 2. Incorporation of strain relief zipper in sealing closure. 3. Incorporation of redesigned ventilation inlet and outlet fittings with automatic locking and redundant sealing features. 4. Replace Nomex (HT-1) coverlayer with integrated thermal and mi crometeori ty cover layer. c. Gloves - Incorporate new design with increased mobility, abrasion resistance and thermal protection. d. Bio-connector - Self-alighment, pin protective design.
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Figure 1 depicts the principal physical differences between the old G3C suit and the new EVA G4C suit. Figure 2 shows that with one visor down on the new G4C helmet, there is practi caI ly no attenutation of Ii ght entering, whereas Figure 3 shows that with two of the visors down there is a
Where this file fits in the PURSUE archive
This file is one of NASA's 40 files in the Trump PURSUE disclosure. Within the NASA agency block it ranks #35 of 40 by Anomalousness Index. Across the entire 450-file archive it ranks #188 of 450.
That places it in the lower-scoring band of the archive (188 of 450 by score), typical of investigative-record style files where the report is paper-based rather than instrumented.
For the broader cluster context, this file is part of Gemini 4 UFO - the three classified Gemini 4 debriefings (D016/D017/D018) documenting McDivitt's 1965 encounter with an unidentified orbiting object near Hawaii. The cluster page walks through all 3 member files with regional grouping, sensor breakdown, and standout analysis.
Anomalousness Index: 59/100
Evidentiary weight that this encounter remains unexplained after conventional analysis. Not a probability of extraterrestrial origin - that number is not honestly computable from the released files and this tracker refuses to publish it.
🤖 AI-ASSISTED SCORING · methodology
The six rubric components break down for this file as follows. Each component has a weighted contribution to the final score; the per-component explanation below describes what this file's particular value on that component means in the rubric's framework.
No sensor, camera, or instrument backs this observation - it is testimony, relayed through NASA, and scored on the rubric's lowest sensor-quality tier for that reason. That doesn't bear on the witness's credibility (a separate axis); it reflects only that nothing beyond human perception recorded the event.
This June 3-7, 1965 account comes from an astronaut on the official federal record - NASA's highest-credibility witness tier in the rubric, spanning debriefings and mission transcripts from Mercury through Apollo. It's one of six score components, not a standalone verdict; the astronaut-witness files that also score highest on sensor quality and disposition are the eight tied at the archive's top score of 72.
On corroboration, this file from NASA - like every single-tier file in the PURSUE archive - is a single-witness or single-instrument capture per the released metadata. The rubric doesn't infer multi-witness confirmation the summaries don't actually establish; this score reflects the honest limit of what was released, not a judgment about the underlying event.
The released file contains no speed, acceleration, or vector data precise enough to score on the kinematic axis - and that's true archive-wide, not specific to this file. The rubric declines to infer kinematic anomaly from a witness's narrative estimate of how fast something moved; that itself says something about what PURSUE actually released: descriptive accounts, not flight-path telemetry.
Every file in the archive, including this one, scores this tier: a conventional explanation was considered in the released record but isn't treated as dispositive. That's a pattern in how war.gov's own summaries are written - they consistently hedge against strong conclusions either way - and the rubric takes that hedging at face value rather than resolving it for them.
This file was released as open by NASA after a formal review process concluded - not simply logged and left pending. That's a stronger disposition signal than 'unresolved, no review': a review actually happened, and remaining open is NASA's own published conclusion from it, not an absence of one.
Bottom line on the score: the Anomalousness Index of 59/100 reflects evidentiary weight that this specific file's encounter remains structurally unexplained by the rubric's six axes - it is not a claim that the underlying event involved anything non-conventional, and it is not comparable across rubrics that use different weights. For the full per-axis weights and the rubric JSON, see /methodology.
Related files in NASA
Other PURSUE files in the same category, ranked by Anomalousness Index.
NASA-UAP-D003A, Gemini 7 Audio Excerpt, 1965
NASA-UAP-D023, Interview Excerpt with Astronaut Gordon Cooper, 1962
NASA-UAP-D030, STS-80 Unidentified Object Image 1, 1996
NASA-UAP-D031, STS-80 Unidentified Object Image 2, 1996
NASA-UAP-D032, STS-80 Unidentified Object Image 3, 1996
NASA-UAP-D003, Gemini 7 Transcript, 1965
Verification
SHA-256:
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