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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 precisely as per our checklist. And it was very good. I don't have any complaints about that at all. It's these other little things that you don't think about and didn't consider that took more time than we thought. There was one control on the PLSS that surprised us. I don't know if it was different from the trainers or the flight PLSS's at the time we were looking at them or not, but there was a press-to-test knob of some sort that neither one of us could correctly identify as to function. At this time, we aren't really quite sure what it does. ## ALDRIN It was a thumb depress button that seemed to go in somewhere as if it was relieving some pressure from something. I can't remember ever having seen that before. It protruded out toward your back and looked as if it might come fairly close to riding on the back of the suit. ## ARMSTRONG We both thought we knew the EMU very well and knew every function and how it operated. But it turned out we were wrong. It was something that we hadn't learned there, ## CONFIDENTIAL
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