Gemini 4 Experiment Debriefing, 1967

This NASA file from 1965 combines Mission Operation Report M-913-65-04 on the Gemini 4 (GT-4) flight with related correspondence. Memoranda from the Associate Administrator for Manned Space Flight describe the planned four-day mission with James McDivitt and Edward White, including a spacewalk, a rendezvous with the booster second stage and thirteen experiments. Later letters and telegrams from NASA's Manned Space Science office concern the astronaut debriefing and requests for GT-4 photography and film for scientific analysis.

From the source: Release of 2026-06-12 Incident: June 3-7, 1965, Low Earth Orbit. 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.

M-913-65-04
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 ca I ly
no attenutation of
Ii ght entering, whereas
Figure 3 shows that
with two of the visors
down there is a
noticeable difference
in the amount of
light that enters the
astronaut's eyes.
With the third visor
down, there would
be a similar decrease
in the amount of
I ight al lowed to enter
the helmet.
The multivarious layers
of materials used in
the EVA G4C suits
are delineated in
Figure 4. It should
be noted that the old
G3C suit consisted
only of the pressure
and restraint layers
of Figure 4 with the
HT -1 nylon outer
protective layer.
The EVA spacesuit
has received the
following qualifi
cation tests:
FIG.
G-4C
OVER VISOR
SPACE
HELMET
6/1/65 Page 3