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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 ARMSTRONG The results of that were very, very good and the residuals were very small, 0.30 and 0.20. But there was some question about the fact we had a relatively large EMS residual; namely, 3.8 ft/sec in about a 20-ft/sec burn. The predicted knowledge of tail-offs apparently was badly in error or else the knowledge of the EMS itself in the tail-off region was badly in error. That never was corrected throughout the flight. We saw this condition through the rest of the SPS burns. ALDRIN Did it say anything about the sextant star check? They updated that. It was pretty much out of sequence. ARMSTRONG The first one they gave us. Then the second one was in that direction because, of course, the LM was there. COLLINS It was our desire that insofar as possible an inertial attitude check be made (in the absence of the burn) so that if you made the burn they knew you were in fact pointing in the right inertial direction. Of course, the LM is out in front of you and you can't look down the X-axis of the optics, so you're constrained not to point any closer to the X-axis than the LM will allow. However, the initial values that they gave us were sort of like down the Z-axis. Of course, you could have the CONFIDENTIAL
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