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Wiring to NASA Technical Standards (updated 2016)
Old article floating around for years, which I first saw featured on MAKE magazine (2012), outlines how to solder two solid core wires to NASA standards.
The technical specification document in question is NASA-STD-8739.4 - WORKMANSHIP STANDARD FOR CRIMPING, INTERCONNECTING CABLES, HARNESSES, AND WIRING (2016-06-30)