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This is Volume 1 of NASA's Apollo 11 Technical Crew Debriefing, dated July 31, 1969. The Mission Operations Branch of the Flight Crew Support Division at the Manned Spacecraft Center in Houston prepared it, and it was originally classified Confidential. In it Armstrong, Aldrin and Collins go phase by phase through suiting, launch, powered flight, Earth orbit and lunar surface activities. They comment on suit fit, vibration, checklists, lunar dust, footing and poor sleeping conditions in the lunar module. A section titled Visual Sightings appears in the table of contents.
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# CONFIDENTIAL ## 3.4 HOLDDOWN RELEASE ## ARMSTRONG Now, release itself, I think we have a little bit of difference there. I felt that I could detect release, and I think your comments were that perhaps you weren't quite so sure what the moment of release was. ## 3.5 LIFT-OFF ALDRIN I can't recall any sudden change that occurred at that point, but it seems to me that there was a gradual sensation of upward movement. Then the vibration - well, it was more of an oscillation, I think, than a vibration. It certainly wasn't just longitudinal; it was a fair amount of motion in both the Y-direction and in the Z-direction. I don't know what the frequency was, but I'd call it a couple of cycles per second. It was a little surprising to me, and this started rather suddenly. ## COLLINS About the time of lift-off, that's what I thought. I couldn't detect lift-off by the conventional means of sensing a transverse acceleration. However, the moment of lift-off was very apparent because this vehicle, which had been rigidly held, was now suddenly released and we were getting all manner of oscillations - X, Y, and Z, as near as I could # CONFIDENTIAL
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