NASA-UAP-D018: Gemini 4 Experiment Debriefing, 1967
This released document records that the G4C suit has new features including a triple lens shield for visual, thermal, impact, and micrometeorite protection. The file preserves the source account or analysis but does not independently establish interpretations beyond the cited record. This document is useful as an officially released artifact because it preserves the file's provenance and lets its claims be compared with related Release 03 records.
- File
- Document · Release 03
- Date
- June 3-7, 1965
- Location
- Low Earth Orbit
- Extent
- 224 pages
Search This File
Probed Assessment
This released document records that the G4C suit has new features including a triple lens shield for visual, thermal, impact, and micrometeorite protection. The file preserves the source account or analysis but does not independently establish interpretations beyond the cited record.
Key takeaways
- The source states that the G4C suit has new features including a triple lens shield for visual, thermal, impact, and micrometeorite protection.
- The source states that the Gemini IV mission was intended to further demonstrate manned space flight for a period of four days.
- The source states that the Office of Public Affairs publishes a comprehensive series of pre-launch and post-launch reports on NASA flight missions which are available for general distribution.
Why it matters
This document is useful as an officially released artifact because it preserves the file's provenance and lets its claims be compared with related Release 03 records.
Corroboration
The release metadata and stored source material corroborate the file's provenance. Reported sightings, interpretations, and allegations remain attributed to the source unless independently supported by the cited evidence.
Open questions
- • What additional contemporaneous records or independent evidence could test the source account?
Probed separates this editorial assessment from the source claims below. It summarizes what the released artifact supports; it is not independent verification.
Official Description from War.gov
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.
Preserved verbatim as source metadata. This wording is separate from Probed’s file-specific description and assessment.
File Context
Related entities
Release provenance
- Release
- Release 03
- Official ID
- release-03-file-064-nasa-uap-d018-gemini-4-experiment-debriefing-1967
- Cleared
- Jun 12, 2026
Referenced Timeline
Launch of Gemini IV
The Gemini IV mission was launched from Complex 19 at the John F. Kennedy Space Center.
Completion of Gemini IV mission
The Gemini IV mission was completed after a four-day flight.
LinkedGemini IVAstronauts recount observations of bright particles
Astronauts recounted their observations of bright particles outside the spacecraft.
Source Claims
Claims are attributed to the released source and remain distinct from Probed’s assessment and tracker findings.
The G4C suit has new features including a triple lens shield for visual, thermal, impact, and micrometeorite protection.
The G4C suit has the following new features: a. Helmet -incorporation of triple lens shield (visors) for visual, thermal, impact, and micrometeorite protection.
The Gemini IV mission was intended to further demonstrate manned space flight for a period of four days.
This GT-4 mission is intended to further demonstrate manned space flight for a period of four days, the longest ever flown by two astronauts.
The Office of Public Affairs publishes a comprehensive series of pre-launch and post-launch reports on NASA flight missions which are available for general distribution.
The Office of Public Affairs publishes a comprehensive series of pre-launch and post-launch reports on NASA flight missions which are available for general distribution.
Because the duration of the flight is one of the most significant aspects of their mission, the post- flight activities will involve expanded medical evaluation as compared with previous missions, including at least 24 hours aboard the recovery aircraft carrier, the USS WASP.
Because the duration of the flight is one of the most significant aspects of their mission, the post- flight activities will involve expanded medical evaluation as compared with previous missions, including at least 24 hours aboard the recovery aircraft carrier, the USS WASP.
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.
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.
The GLV, on sata SEPARATE, TURN AROUND, the other hand, uses self-igniting £ fuels which, upon mixing, create a fireball small enough so that the pieates astronauts can eject from the | spacecraft in much the same man- a 5 MIN.
The GLV, on sata SEPARATE, TURN AROUND, the other hand, uses self-igniting £ fuels which, upon mixing, create a fireball small enough so that the pieates astronauts can eject from the | spacecraft in much the same man- a 5 MIN.
(The only thing that)bothers me Just a little bit is you saying because Gordo said he could — he woke up in the daylight — pointed at the sky, he could tell whether it was day or night, and therefore it was an airglow.
(The only thing that)bothers me Just a little bit is you saying because Gordo said he could — he woke up in the daylight — pointed at the sky, he could tell whether it was day or night, and therefore it was an airglow.
on the average from to altitude Regardless of their brightness/meteors appear kx 40 and 60 miles/in the earth's atmosphere, Bright meteors are seen to reach about 40 miles, whereas immixkkx large fireballs may still be seen as low as 20 miles or so.
on the average from to altitude Regardless of their brightness/meteors appear kx 40 and 60 miles/in the earth's atmosphere, Bright meteors are seen to reach about 40 miles, whereas immixkkx large fireballs may still be seen as low as 20 miles or so.
Real time tracking and the acqui- sition of data for post flight evaluation will be provided by optical and photo- graphic systems, MISTRAM, GE Mod III radar, C-band radar, and the Impact Predictor (IP) 7094.
Real time tracking and the acqui- sition of data for post flight evaluation will be provided by optical and photo- graphic systems, MISTRAM, GE Mod III radar, C-band radar, and the Impact Predictor (IP) 7094.
The GT-4 mission employs a zone concept for recovery which estab- lishes four recovery zones: East Atlantic, West Atlantic, West Pacific and Mid- Pacific.
The GT-4 mission employs a zone concept for recovery which estab- lishes four recovery zones: East Atlantic, West Atlantic, West Pacific and Mid- Pacific.
MSC-1, Electrostatic Charge Before rendezvous missions are attempted, an investigation must be made of the possibility of inadvertent ignition of pyrotechnics and other detri- mental effects due to discharge of electrostatic charge potentials during rendezvous.
MSC-1, Electrostatic Charge Before rendezvous missions are attempted, an investigation must be made of the possibility of inadvertent ignition of pyrotechnics and other detri- mental effects due to discharge of electrostatic charge potentials during rendezvous.
In this capacity he prepared and delivered academic lectures and simulator briefings, and flight test brief- ings on the theory and practice of spacecraft testing.
In this capacity he prepared and delivered academic lectures and simulator briefings, and flight test brief- ings on the theory and practice of spacecraft testing.
They have already been granted permis- sion to continue their journey for another day and Gemini officials see no current prob- lems that might foreshorten an eight-day mission.
They have already been granted permis- sion to continue their journey for another day and Gemini officials see no current prob- lems that might foreshorten an eight-day mission.
= resent plans call for ten manned Cemini missions Spaced three months apart, beginning in the last quarter of Calendar Year 1964, Overall responsibility for manned space science investigations is assigned to Mr.
= resent plans call for ten manned Cemini missions Spaced three months apart, beginning in the last quarter of Calendar Year 1964, Overall responsibility for manned space science investigations is assigned to Mr.
I went to congratulate you on the fine reports you have been submitting for your S-13 experiment and especially the document entitled “Definitive Plan." The full documentation of your experiment is very important and I em gled to see you are keeping up with thet.
I went to congratulate you on the fine reports you have been submitting for your S-13 experiment and especially the document entitled “Definitive Plan." The full documentation of your experiment is very important and I em gled to see you are keeping up with thet.
Source Material & Evidence
Mission Operation Report No. M-913-65-04
M-913-65-04
Figure 1: Physical differences between G3C and G4C suits
Figure 4: Multivarious layers of materials in the EVA G4C suits
Figure 5: Zero g Integral Propulsion (ZIP) Unit
Research Map
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