The name comes from a 1993 US Air Force Space Command motto, “Guardians of the High Frontier." From earlier reports they want to evolve a Search & Rescue capability as crewed cislunar traffic increases, sort of like the US Coast Guard.
An S&R function would also fit with DoD and NASA's recent interest in developing high-thrust nuclear propulsion engines. Imagine replacing the RaptoVacs on a Starship with nuclear engines




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