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The 373-4 near Searcy was fully loaded with 150 tons of liquid fuel - Aerozine 50, a mixture of hydrazine, dinitrogen tetroxide, and unsymmetrical dimethylhydrazine - that is 78 percent oxygen.

Outside of the occasional consulting gig, knowing about unsymmetrical dimethylhydrazine isn’t all that useful in the quaint town of Simsbury.

At that moment, precisely on schedule, fuming nitric acid fuel began spraying into the rocket's thrust chamber, followed a few milliseconds later by the oxidizer, unsymmetrical dimethylhydrazine.