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The engine display in front of Bldg. 4205.

On my first visit to Propulsion Park, the display consisted of, from left to right, F-1 rocket engine F-4023, a NERVA, and a linear aerospike engine.

Even though the SRB would not be emplaced for another year and a half, the large concrete pad (behind the linear aerospike) on which the SRB would be mounted was already present.