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View of the combustion chamber and LOX dome taken from the catwalk.

F-107-1 is displayed with no injector, offering a view of aft face of the LOX dome.

Vince Wheelock speculates that, as a test engine, this F-1 was torn down at some point in its life and when it was reassembled, the injector was not installed (and perhaps became a display piece on someone's wall).