"the tapes were moved in 1970 to the US National Archives"
Not good. The US National Archives destroyed many of the Naval Research Laboratory records sent there for storage.
No substitute for plain incompetence.
And SamAdams, I too am beginning to believe Wayne Green and others that the whole thing is a put on show because the scientists found no one could surive outside the Van Allen belts due to the high energy particles and radiation.That's why it has been nothing but robots since.