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.