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The F-1 rocket engine thrust chamber, connected to a crane, in preparation for its fit test.

Directly behind the engine, just peeking out on the F-1's right side, is the J-2 engine destined to be installed next to it in front of Building 4200.

At back left we see the NERVA and XRS-2200 linear aerospike engines which would be installed in front of Building 4205.