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Detail of the aft end of the S-II with two of its J-2 engines removed.

This was a testing, rather than flight, S-II stage. As such, the stage lacks the plumbing connecting the LOX and liquid helium tanks to the engines. See my pictures of the LOX line on the S-II stage at Johnson Space Center (the official visitor center of which is Space Center Houston) and the hydrogen feed lines on the S-II stage in the Apollo-Saturn V Center at Kennedy Space Center.