JimO: On page 160 of "Dark Moon" Bennett and Percy credit NASA for the three still photos from the film, so perhaps it was made for training purposes.

Good to see you got plenty of help on the sci.space.history newsgroup, though it's amusing to see the claims that it's a computer animation rather than a piece of good old-fashioned film. In "What Happened on the Moon?" they show it slowed down to half speed and it looks like a model filmed in direct sunlight.