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Portion of the base heat shield and the interface between S-IC and transporter. The yellow rectangle is the base of the hold down post.

Peering into the F-1 at the right, the regenerative cooling tubes and the interface between the thrust chamber and nozzle extension can be seen.

At the center of this F-1's injector is a thrust chamber throat security closure shaft. This shaft supported a closure which protected the engine's throat and injector during shipping.